Patent Publication Number: US-2015072709-A1

Title: Integration of a computer-based message priority system with mobile electronic devices

Description:
RELATED APPLICATIONS 
     This application is a continuation of U.S. Ser. No. 12/258,749, filed Oct. 27, 2008, entitled “Integration of a Computer-Based Message Priority System With Mobile Electronic Devices”, now allowed, which is a continuation of U.S. Ser. No. 10/795,695, filed Mar. 8, 2004, entitled “Integration of a Computer-Based Message Priority System With Mobile Electronic Devices”, now U.S. Pat. No. 7,444,384, which is a continuation of Ser. No. 09/365,293, filed on Jul. 30, 1999, entitled “Integration of a Computer-Based Message Priority System With Mobile Electronic Devices”, now U.S. Pat. No. 6,714,967, which is related to the cofiled, copending and coassigned applications entitled “Method for Automatically Assigning Priorities to Documents and Messages”, filed on Jul. 30, 1999 and assigned Ser. No. 09/364,527, now U.S. Pat. No. 7,194,681, “Methods for Routing Documents based on a Measure of Criticality”, filed on Jul. 30, 1999 and assigned Ser. No. 09/364,528, now U.S. Pat. No. 6,622,160, “Methods for Display, Notification, and Interaction with Prioritized Messages”, filed on Jul. 30, 1999, and assigned Ser. No. 09/364,522, now U.S. Pat. No. 7,120,865, and “A Computational Architecture for Managing the Transmittal and Rendering of Information, Alerts, and Notifications”, filed on Jul. 30, 1999 and assigned Ser. No. 09/365,287, now U.S. Pat. No. 6,618,716, the entireties of all of which are incorporated herein by reference. 
    
    
     FIELD OF THE INVENTION 
     This invention relates generally to prioritized text such as prioritized email messages, and more particularly to electronic device alerting for such prioritized text. 
     BACKGROUND OF THE INVENTION 
     Electronic mail programs have become a popular application among computer users. Especially with the advent of the Internet, exchanging email has almost become a reason why people purchase computers for personal reasons, and within many corporate environments, email has become the standard manner by which coworkers exchange information. However, with the increasing popularity of email, shortcomings have become apparent. 
     Chief among these shortcomings is that many users now face a deluge of email every day, such that the capability of being able to send and receive email has almost become a hindrance to their day-to-day ability to get their job done, as opposed to being an asset. Some users report receiving over 100 email messages a day. With such large numbers of email, it is difficult to manage the email, such that the users read the most important messages first. 
     Limited solutions to this problem have been attempted in the prior art. Prior art exists for attempting to curtail the amount of junk email—e.g., unsolicited email, typically regarding a service or product for sale—that users receive. Moreover, some electronic mail programs allow for the generation of rules that govern how an email is managed within the program—for example, placing all emails from certain coworkers in a special folder. 
     These limited solutions, however, do not strike at the basic problem behind email—that with so much email being received, it would be most useful for a user to be able to have his or her computer automatically prioritize the email by importance or review urgency, and perform actions based on that prioritization. For these and other reasons, there is a need for the present invention. 
     SUMMARY OF THE INVENTION 
     The invention relates to electronic device alerting for prioritized text. In one embodiment, a computer-implemented method first receives a text. The method generates a priority of the text, based on a text classifier such as a Bayesian classifier or a support-vector machine classifier. The method then alerts a user on an electronic device, such as a pager or a cellular phone, based on an alert criteria. 
     Embodiments of the invention provide for advantages over the prior art. A user, for example, in one embodiment, may ask that he or she only be disturbed if the priority of the text is greater than a given threshold. Thus, even if the user receives over 100 different email, he or she will be alerted to the most important email, and then will be able to deal with the other email when the user has time. Prioritization, in other words, makes email much more useful in environments where a lot of email is exchanged on a regular basis. 
     Embodiments of the invention include computer-implemented methods, computer-readable media, and computerized systems of varying embodiments. Still other embodiments, advantages and aspects of the invention will become apparent by reading the following detailed description, and by reference to the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram of an operating environment in conjunction with which embodiments of the invention may be practiced; 
         FIG. 2  is a diagram showing explicit and implicit training of a text classifier, according to an embodiment of the invention; 
         FIG. 3  is a diagram showing how a priority for a text is generated by input to a text classifier, according to an embodiment of the invention; 
         FIG. 4(   a ) is a diagram of a scheme according to which the priority of a text can be classified, according to an embodiment of the invention; 
         FIG. 4(   b ) is a diagram of another scheme according to which the priority of a text can be classified, according to another embodiment of the invention; 
         FIG. 5(   a ) is a graph showing linear cost functions of high, medium and low priority texts, according to an embodiment of the invention; 
         FIG. 5(   b ) is a graph showing a non-linear cost function for a text, according to an embodiment of the invention; 
         FIG. 6  is a diagram showing classes of evidence that can be used to make an inference about a user&#39;s activity (e.g., if a user is present), according to one embodiment of the invention; 
         FIG. 7  is a diagram showing a Bayesian network that can be used for inferring a user&#39;s activity (e.g., if a user is present), according to one embodiment of the invention; 
         FIGS. 8-10  are influence diagrams showing how in one embodiment decision models can be utilized to make the decision as to how and when to alert a user to a message; 
         FIG. 11  is a flowchart of a method according to an embodiment of the invention; 
         FIG. 12  is a diagram of a system according to an embodiment of the invention; 
         FIG. 13  is a diagram of a system according to another embodiment of the invention; and, 
         FIG. 14  is a diagram of a user interface via which alert criteria can be modified, according to an embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In the following detailed description of exemplary embodiments of the invention, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration specific exemplary embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and that logical, mechanical, electrical and other changes may be made without departing from the spirit or scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims. 
     Some portions of the detailed descriptions which follow are presented in terms of algorithms and symbolic representations of operations on data bits within a computer memory. These algorithmic descriptions and representations are the means used by those skilled in the data processing arts to most effectively convey the substance of their work to others skilled in the art. An algorithm is here, and generally, conceived to be a self-consistent sequence of steps leading to a desired result. The steps are those requiring physical manipulations of physical quantities. Usually, though not necessarily, these quantities take the form of electrical or magnetic signals capable of being stored, transferred, combined, compared, and otherwise manipulated. 
     It has proven convenient at times, principally for reasons of common usage, to refer to these signals as bits, values, elements, symbols, characters, terms, numbers, or the like. It should be borne in mind, however, that all of these and similar terms are to be associated with the appropriate physical quantities and are merely convenient labels applied to these quantities. Unless specifically stated otherwise as apparent from the following discussions, it is appreciated that throughout the present invention, discussions utilizing terms such as processing or computing or calculating or determining or displaying or the like, refer to the action and processes of a computer system, or similar electronic computing device, that manipulates and transforms data represented as physical (electronic) quantities within the computer system&#39;s registers and memories into other data similarly represented as physical quantities within the computer system memories or registers or other such information storage, transmission or display devices. (It is noted that the terms document and text are used interchangeably herein and should be construed as interchangeable as well.) 
     Operating Environment 
     Referring to  FIG. 1 , a diagram of the hardware and operating environment in conjunction with which embodiments of the invention may be practiced is shown. The description of  FIG. 1  is intended to provide a brief, general description of suitable computer hardware and a suitable computing environment in conjunction with which the invention may be implemented. Although not required, the invention is described in the general context of computer-executable instructions, such as program modules, being executed by a computer, such as a personal computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform particular tasks or implement particular abstract data types. 
     Moreover, those skilled in the art will appreciate that the invention may be practiced with other computer system configurations, including hand-held devices, multiprocessor systems, microprocessor-based or programmable consumer electronics, network PC&#39;s, minicomputers, mainframe computers, and the like. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote memory storage devices. 
     The exemplary hardware and operating environment of  FIG. 1  for implementing the invention includes a general purpose computing device in the form of a computer  20 , including a processing unit  21 , a system memory  22 , and a system bus  23  that operatively couples various system components include the system memory to the processing unit  21 . There may be only one or there may be more than one processing unit  21 , such that the processor of computer  20  comprises a single central-processing unit (CPU), or a plurality of processing units, commonly referred to as a parallel processing environment. The computer  20  may be a conventional computer, a distributed computer, or any other type of computer; the invention is not so limited. 
     The system bus  23  may be any of several types of bus structures including a memory bus or memory controller, a peripheral bus, and a local bus using any of a variety of bus architectures. The system memory may also be referred to as simply the memory, and includes read only memory (ROM)  24  and random access memory (RAM)  25 . A basic input/output system (BIOS)  26 , containing the basic routines that help to transfer information between elements within the computer  20 , such as during start-up, is stored in ROM  24 . The computer  20  further includes a hard disk drive  27  for reading from and writing to a hard disk, not shown, a magnetic disk drive  28  for reading from or writing to a removable magnetic disk  29 , and an optical disk drive  30  for reading from or writing to a removable optical disk  31  such as a CD ROM or other optical media. 
     The hard disk drive  27 , magnetic disk drive  28 , and optical disk drive  30  are connected to the system bus  23  by a hard disk drive interface  32 , a magnetic disk drive interface  33 , and an optical disk drive interface  34 , respectively. The drives and their associated computer-readable media provide nonvolatile storage of computer-readable instructions, data structures, program modules and other data for the computer  20 . It should be appreciated by those skilled in the art that any type of computer-readable media which can store data that is accessible by a computer, such as magnetic cassettes, flash memory cards, digital video disks, Bernoulli cartridges, random access memories (RAMs), read only memories (ROMs), and the like, may be used in the exemplary operating environment. 
     A number of program modules may be stored on the hard disk, magnetic disk  29 , optical disk  31 , ROM  24 , or RAM  25 , including an operating system  35 , one or more application programs  36 , other program modules  37 , and program data  38 . A user may enter commands and information into the personal computer  20  through input devices such as a keyboard  40  and pointing device  42 . Other input devices (not shown) may include a microphone, joystick, game pad, satellite dish, scanner, or the like. These and other input devices are often connected to the processing unit  21  through a serial port interface  46  that is coupled to the system bus, but may be connected by other interfaces, such as a parallel port, game port, or a universal serial bus (USB). A monitor  47  or other type of display device is also connected to the system bus  23  via an interface, such as a video adapter  48 . In addition to the monitor, computers typically include other peripheral output devices (not shown), such as speakers and printers. 
     The computer  20  may operate in a networked environment using logical connections to one or more remote computers, such as remote computer  49 . These logical connections are achieved by a communication device coupled to or a part of the computer  20 ; the invention is not limited to a particular type of communications device. The remote computer  49  may be another computer, a server, a router, a network PC, a client, a peer device or other common network node, and typically includes many or all of the elements described above relative to the computer  20 , although only a memory storage device  50  has been illustrated in  FIG. 1 . The logical connections depicted in  FIG. 1  include a local-area network (LAN)  51  and a wide-area network (WAN)  52 . Such networking environments are commonplace in office networks, enterprise-wide computer networks, intranets and the Internal, which are all types of networks. 
     When used in a LAN-networking environment, the computer  20  is connected to the local network  51  through a network interface or adapter  53 , which is one type of communications device. When used in a WAN-networking environment, the computer  20  typically includes a modem  54 , a type of communications device, or any other type of communications device for establishing communications over the wide area network  52 , such as the Internal. The modem  54 , which may be internal or external, is connected to the system bus  23  via the serial port interface  46 . In a networked environment, program modules depicted relative to the personal computer  20 , or portions thereof, may be stored in the remote memory storage device. It is appreciated that the network connections shown are exemplary and other means of and communications devices for establishing a communications link between the computers may be used. 
     Generating a Priority for a Text 
     In this section of the detailed description, the generation of a priority for a text such as an email, according to one embodiment of the invention, is described. The generation of priorities for texts as described can then be used in methods, systems, and computer-readable media (as well as other embodiments) of the invention as are presented in other sections of the detailed description. The description in this section is provided in conjunction with  FIG. 2  and  FIG. 3 , the former which is a diagram showing explicit and implicit training of a text classifier, according to an embodiment of the invention, and the latter which is a diagram showing how a priority for a text is generated by input to a text classifier, according to an embodiment of the invention. The description is also provided in conjunction with  FIGS. 4(   a ) and  4 ( b ), which are diagrams of different schema according to which the priority of a text can be classified, and in conjunction with  FIGS. 5(   a ) and  5 ( b ), which are graphs showing different cost functions that may be applicable depending on text type. 
     Referring first to  FIG. 2 , the text classifier  200  is able to be trained both explicitly, as represented by the arrow  202 , and implicitly, as represent by the arrow  204 . The explicit training represented by the arrow  202  is usually conducted at the initial phases of constructing the text classifier  200 , while the implicit training represented by the arrow  204  is usually conducted after the text classifier  200  has been constructed, to fine tune the classifier  200 . However, the invention is not so limited. 
     The text classifier  200  in one embodiment is a Bayesian classifier, as known within the art, while in another embodiment it is a support vector machine (SVM) classifier, as also known within the art. Text classification methodology based on a Bayesian learning approach is specifically described in the reference M. Sahami, S. Dumais, D. Heckerman, E. Horvitz, A Bayesian Approach to Junk E-Mail Filtering, AAAI Workshop on Text Classification, July 1998, Madison, Wis., AAAI Technical Report WS-98-05, which is hereby incorporated by reference. Text classification methodology based on an SVM approach is specifically described in the following references: the coassigned patent, U.S. Pat. No. 5,864,848, issued Jan. 26, 1999, which is hereby incorporated by reference; the previously filed and coassigned case entitled “Methods and Apparatus for Building a Support Vector Machine Classifier,” Ser. No. 09/055,477, filed on Apr. 6, 1998, which is also hereby incorporated by reference; and, the reference J. Platt, Fast Training of Support Vector Machines using Sequential Minimal Optimization, MIT Press, Baltimore, Md., 1998, which is also hereby incorporated by reference. For purposes of this application, specific description is made with reference to an SVM classifier, although those of ordinary skill within the art can appreciate that the invention is not so limited. 
     As shown in  FIG. 2 , the explicit training of the text classifier  200  as represented by the arrow  202  includes constructing the classifier in  206 , including utilizing feature selection. In general, Support Vector Machines build classifiers by identifying a hyperplane that separates a set of positive and negative examples with a maximum margin. In the linear form of SVM that is employed in one embodiment, the margin is defined by the distance of the hyperplane to the nearest positive and negative cases for each class. Maximizing the margin can be expressed as an optimization problem. A post-processing procedure described in the Platt reference is used that employs regularized maximum likelihood fitting to produce estimations of posterior probabilities. The method fits a sigmoid to the score that is output by the SVM classifier. 
     In the explicit training, the text classifier is presented with both time-critical and non-time-critical texts (e.g., email messages), so that it may be able to discriminate between the two. This training set may be provided by the user, or a standard training set may be used. Given a training corpus, the text classifier first applies feature-selection procedures that attempt to find the most discriminatory features. This process employs a mutual-information analysis. Feature selection can operate on single words or higher-level distinctions made available, such as phrases and parts of speech tagged with natural language processing—that is, the text classifier  200  is able to be seeded with specially tagged text to discriminate features of a text that are considered important. 
     Feature selection for text classification typically performs a search over single words. Beyond the reliance on single words, domain-specific phrases and high-level patterns of features are also made available. Special tokens can also enhance classification. The quality of the learned classifiers for email criticality can be enhanced by inputting to the feature selection procedures handcrafted features that are identified as being useful for distinguishing among email of different time criticality. Thus, during feature selection, single words as well as special phrases and symbols that are useful for discriminating among messages of different levels of time criticality are considered. 
     Tokens and patterns of value in identifying the criticality of messages include such distinctions as (including Boolean combinations thereof): 
     To: field
 
Addressed just to user
 
Addressed to only a few people including user
 
Addressed to an alias with a small number of people
 
Addressed to several aliases with a small number of people
 
Cc:&#39;d to user
 
Bcc:&#39;d to user
 
     People 
     Names on pre-determined list of important people
 
Family members
 
People at company
 
Organization chart structure
         Managers I report to   Managers of managers of people I report to   People who report to me
 
External business people
 
Past tense
 
These include descriptions about events that have already occurred such as:
       

     We met 
     meeting went
 
happened
 
got together
 
took care of
 
meeting yesterday
 
Future tense
 
     Tomorrow 
     This week
 
Are you going to
 
     When can we 
     Meeting and coordination
 
Get together
 
Can you meet
 
Will get together
 
Coordinate with
 
Need to get together
 
Resolved dates
 
Dates indicated from text and msg. time (e.g., tomorrow, send yesterday)
 
     Questions 
     Word+? 
     Indications of personal requests: 
     Can you 
     Are you 
     Will you 
     you please 
     Can you do 
     Indications of need:
 
I need
 
He needs
 
She needs
 
I&#39;d like
 
It would be great
 
I want
 
He wants
 
She wants
 
Take care of
 
Time criticality
 
happening soon
 
right away
 
deadline will be
 
deadline is
 
as soon as possible
 
needs this soon
 
to be done soon
 
done right away
 
     Importance 
     is important
 
is critical
 
     Word+! 
     Explicit priority flag status (low, none, high)
 
Length of message
 
Number of bytes in component of new message
 
Signs of Commercial and Adult-Content Junk email
 
     Free!! 
     !!! 
     Under 18 
     Adult 
     Percent caps
 
Percent nonalphanumeric characters
 
etc.
 
     Other features that may be used for feature selection are described in the cofiled, copending and coassigned application entitled “A Computational Architecture for Managing the Transmittal and Rendering of Information, Alerts, and Notifications,” U.S. Ser. No. 09/365,287, which is hereby incorporated by reference, and in the copending and coassigned application entitled “Methods and Apparatus for Building a Support Vector Machine Classifier,” U.S. Ser. No. 09/055,477, filed on Apr. 6, 1998, which has already been incorporated by reference. 
     Furthermore, still referring to  FIG. 2 , implicit training of the text classifier  200 , as represented by the arrow  204 , can be conducted by continually watching the user work in  210 . The assumption is that as users work, and lists of mail are reviewed, time-critical messages are read first, and low-priority messages are reviewed later, or just deleted. That is, when presented with a new email, the user is watched to determine whether or she immediately opens the email, and in what order (if more than one new email are present), deletes the email without opening, and/or replies to the email right away. Thus, the text classifier is such that a user is continually watched while working, and the classifier is continually refined by training in the background and being updated in real time for decision making. For each message inputted into the classifier, a new case for the classifier is created. The cases are stored as negative and positive examples of texts that are either high or low priority. 
     Referring next to  FIG. 3 , a text, such as an email message,  300  is input into the text classifier  200 , which based thereon generates a priority  302  for the text  300 . That is, in one embodiment, the text classifier  200  generates a priority  302 , measured as a percentage from 0 to 1 (i.e., 0% to 100%). This percentage is a measure of the likelihood that the text  300  is of high priority, based on the previous training of the classifier  200 . 
     It is noted that as has been described, the text classifier and the priority generated thereby is based on a scheme where each email in the training phase is construed as either high priority or low priority, such that the priority generated by the text classifier is a measure of the likelihood of the text being analyzed is of high priority. This scheme is specifically shown by reference to  FIG. 4(   a ), where the text classifier  200  is trained by a group of texts  400  that are high priority and a group of texts  402  that are low priority, such that a text to be analyzed  400  is input into the classifier  200 , which outputs a scalar number  406  measuring the likelihood that the text being analyzed is of high priority. However, those of ordinary skill within the art can appreciate that the invention is not so limited. 
     For example, referring to  FIG. 4(   b ), a diagram showing a scheme where texts are divided into low, medium and high priority, according to an embodiment of the invention, is shown. The text classifier  200  in the embodiment of  FIG. 4(   b ) is trained by a group of texts  400  that are high priority and a group of texts  402  that are low priority, as in the previous embodiment, but also by a group of texts  450  that are medium priority. Thus, a text to be analyzed  400  is input into the classifier  200 , which outputs a scalar number  406 , that can measure the likelihood that the text being analyzed is of high priority, if so desired, or medium priority or low priority. The classifier  200  is also able to output a class  452 , which indicates the class of low, medium or high priority that the text  404  most likely falls into. Those of ordinary skill within the art can appreciate that further classes can also be added if desired. 
     The invention is not limited to the definition of priority as this term is used by the text classifier to assign such priority to a text such as an email message. In one embodiment, however, priority is defined in terms of a loss function. More specifically, priority is defined in terms of the expected cost in lost opportunities per time delayed in reviewing the text after it has be received—that is, the expected lost or cost that will result for delayed processing of the text. This loss function can further vary according to the type of text received. 
     For example, the general case is shown in  FIG. 5(   a ), which is a graph of linear cost functions dependent on the priority of a text. In the graph  500 , as time increases, the cost of not having reviewed a text also increases. However, the cost increases more for a high priority message, as indicated by the line  502 , as compared to a medium priority message, as indicated by the line  504 , or a low priority message, as indicated by the line  506 . That is, the high priority line  502  may have a slope of 100, the medium priority line  504  may have a slope of 10, and the low priority line  502  may have a slope of 1. These slope values can then be used by the text classifier to assist in assigning a priority to a given text, for example, by regression analysis. 
     Some messages, however, do not have their priorities well approximated by the use of a linear cost function. For example, a message relating to a meeting will have its cost function increase as the time of the meeting nears, and thereafter, the cost function rapidly decreases—since after the meeting is missed, there is not much generally a user can do about it. This situation is better approximated by a non-linear cost function, as shown in  FIG. 5(   b ). In the graph  550 , the cost function  554  rapidly increases until it reaches the time of the meeting demarcated by the line  552 , after which it rapidly decreases. Thus, those of ordinary skill within the art can appreciate that depending on a message&#39;s type, the cost function can be approximated by one of many different representative cost functions, both linear and non-linear. 
     Thus, as has been described, the priority of a text can be just the likelihood that it is of high priority based on output of a text classifier, or the most likely priority class (i.e., medium, low or high priority) it falls into, also based on the output of the text classifier. However, in another embodiment of the invention, an expected time criticality of each text, such as an email message, is determined. This can be written as 
     
       
         
           
             EL 
             = 
             
               
                 ∑ 
                 i 
                 n 
               
                
               
                   
               
                
               
                 
                   p 
                    
                   
                     ( 
                     
                       critical 
                       i 
                     
                     ) 
                   
                 
                  
                 
                   C 
                    
                   
                     ( 
                     
                       critical 
                       i 
                     
                     ) 
                   
                 
               
             
           
         
       
     
     where EL is the expected loss, p(critical i ) is the probability that a text has the criticality i (e.g., where i=0 may be low priority and i=1 may be high priority, or where i=0 may be low priority, i=1 medium priority and i=2 high priority, etc.), C(critical i ) is the cost function for text having the criticality i, and n is the total number of criticality classes minus one. The cost functions may be linear or non-linear, as has been described—in the case where the function are linear, the cost function is thus the rate of loss. 
     In the case where n=1, specifying that there are only two priority classes low and high, the expected loss can be reformulated as 
         EC=p (critical high ) C (critical high )+[1 −p (critical low )] C (critical low ) 
     where EC is the expected criticality of a text. Furthermore, if the cost function of low criticality messages is set to zero, this becomes 
         EC=p (critical high ) C (critical high ) 
     The total loss until the time of review of a text can be expressed as the integration of the expressed criticality, or, 
         EL=∫   0   t   p (critical high ) C (critical high ) 
     where t is the time of review.
 
Determining when to Alert the User
 
     In this section of the detailed description, described is provided as to determining when to alert the user of a high-priority text, for example, a text that has a likelihood of being high priority greater than a user-set threshold, or greater than a threshold determined by decision theoretic reasoning. That is, beyond knowing about time critical messages, it is also important in one embodiment to decide when to alert a user to time-critical messages if the user is not directly viewing incoming email (in one embodiment). In the general case, a cost of distracting the user from the current task being addressed to learn about the time-critical message is determined 
     In general, a user should be alerted when a cost-benefit analysis suggests that the expected loss the user would incur in not reviewing the message at time t is greater than the expected cost of alerting the user. That is, alerting should be conducted if 
         EL−EC&gt; 0 
     where EL is the expected loss of non-review of the text at a current time t, and EC is the expected cost of alerting the user of the text at the current time t. The expected loss is as described in the previous section of the detailed description. 
     However, this formulation is not entirely accurate, because the user is assumed to review the message on his or her own at some point in the future anyway. Therefore, in actuality, the user should be alerted when the expected value of alerting, referred to as ECA, is positive. The expected value of alerting should thus consider the value of alerting the user of the text now, as opposed to the value of the user reviewing the message later on his or her own, without alert, minus the cost of alerting. This can be stated as 
     
       
      
       EVA=EL 
       alert 
       −EL 
       no-alert 
       −EC  
      
     
     where EL alert  is the expected loss of the user reviewing the message if he or she were to review the message now, upon being alerted, as opposed to EL no-alert , which is the expected loss of the user reviewing the message on his or her own at some point, without being alerted, minus EC, the expected cost of alerting (now). 
     Furthermore, in one specific embodiment of the invention, information from several messages are grouped together into a single compound alert. Reviewing information about multiple messages in an alert can be more costly than an alert relaying information about a single messages. Such increases in distraction can be represented by making the cost of an alert a function of its informational complexity. It is assumed that the EVA of an email message is independent of the EVA of the other email messages. EVA(M i ,t) is used to refer to the value of alerting a user about a single message M i  at time t and ECA(n) is used to refer to the expected cost of relaying the content of n messages. Thus, multiple messages can be considered by summing together the expected value of relaying information about a set of n messages, 
     
       
         
           
             NEVA 
             = 
             
               
                 
                   ∑ 
                   
                     i 
                     = 
                     1 
                   
                   
                       
                   
                 
                  
                 
                     
                 
                  
                 
                   EVA 
                    
                   
                     ( 
                     
                       
                         M 
                         i 
                       
                       , 
                       t 
                     
                     ) 
                   
                 
               
               - 
               
                 
                   ECA 
                    
                   
                     ( 
                     n 
                     ) 
                   
                 
                 . 
               
             
           
         
       
     
     In one embodiment of the invention, it is noted that determining when to alert the user is conducted in accordance with the more rigorous treatment of EVA described in the copending, cofiled and coassigned application entitled “A Computational Architecture for Managing the Transmittal and Rendering of Information, Alerts, and Notifications,” U.S. Ser. No. 09/365,287, which is hereby incorporated by reference. However, the invention is not so limited. 
     It is also noted that in order to determine the expect cost of alerting, it is useful to infer or directly access information about whether the user is present—and therefore can see or hear alerts from the computer—or is not present. Sensors can be used in one embodiment that indicate when a user is in the office, such as infrared sensors, pressure sensors (on the chair), etc. However, if such devices are not available, a probability that a user is in the office can be assigned as a function of user activity on the computer, such as the time since last observed mouse or keyboard activity. Furthermore, scheduling information available in a calendar can also be made use of to make inferences about the distance and disposition of a user, to consider the costs of forwarding messages to the user by different means (e.g., cell phone, pager, etc.). 
     It is also important to know how busy the user is in making decisions about interrupting the user with information about messages with high time criticality. In one embodiment, it is reasoned about whether and the rate at which a user is working on a computer, or whether the user is on the telephone, speaking with someone, or at a meeting at another location. In one embodiment, several classes of evidence can be used to assess a user&#39;s activity or his or her focus of attention, as shown in  FIG. 6 . A Bayesian network, as known in the art, can then be used for performing an inference about a user&#39;s activity; an example of such a network is shown in  FIG. 7 . Utilizing evidence to infer whether the user is present is described more rigorously in the cofiled, copending and coassigned application entitled “A Computational Architecture for Managing the Transmittal and Rendering of Information, Alerts, and Notifications,” U.S. Ser. No. 09/365,287, which has already been incorporated by reference (specifically, with respect to determining an alert-reception probability). Thus, in one embodiment, a probability inference as to whether a user is present is determined in accordance with the description provided in this application. 
     In general, a decision should be made as to when and how to alert users to messages and to provide services (for example) based on the inference of expected criticality and user activity. In one embodiment, this decision is made as described in the cofiled, copending and coassigned application entitled “A Computational Architecture for Managing the Transmittal and Rendering of Information, Alerts, and Notifications,” U.S. Ser. No. 09/365,287, which has already been incorporated by reference (specifically, with respect to the attention management module). 
     In another embodiment, this decision is made by utilizing decision models, as known within the art.  FIGS. 8-10  are influence diagrams, as known within the art, showing how in one specific embodiment such decision models can be utilized to make this decision. Specifically,  FIG. 8  displays a decision model for decisions about interrupting a user, considering current activity, expected time criticality of messages, and cost of alerting depending on the modality.  FIG. 9  also includes variables representing the current location and the influence of that variable on activity and cost of the alternate messaging techniques. Finally,  FIG. 10  is further expanded to consider the costs associated with losses in fidelity when a message with significant graphics content is forwarded to a user without the graphical content being present. 
     In still another embodiment, the decision as to when and how to alerts users is made by employment of a set of user-specified thresholds and parameters defining policies on alerting. In this embodiment, user presence can be inferred based on mouse or keyboard activity. Thus, a user can be allowed to input distinct thresholds on alerting for inferred states of activity and nonactivity. Users can input an amount of idle activity following activity where alerting will occur at lower criticalities. In this embodiment, if it is determined that the user is not available based on the time that no computer activity is seen—or on the user&#39;s inactivity when an attempt to alert is made—then messages and stored, and are reported to the user in order of criticality when the user returns to interact with the computer (or, returns to the room, given the availability of inputs from infrared or other presence detection). 
     Furthermore, in this embodiment, users can specify routing and paging options (as well as other output options) as a function of quantities including expected criticality, maximum expected loss, and value of alerting the user. Such routing, paging and other output options are more specifically described in the copending, cofiled, and coassigned applications entitled “Methods for Routing Documents based on a Measure of Criticality,” U.S. Ser. No. 09/364,528, “Methods for Display, Notification, and Interaction with Prioritized Messages,” U.S. Ser. No. 09/364,522, which are all hereby incorporated by reference. The invention is not so limited, however. 
     Method and System 
     In this section of the detailed description, a computer-implemented method according to an embodiment of the invention is described, and a computerized system according to an embodiment of the invention is described. With respect to the method, the method is desirably realized at least in part as one or more programs running on a computer—that is, as a program executed from a computer-readable medium such as a memory by a processor of a computer. The program is desirably storable on a machine-readable medium such as a floppy disk or a CD-ROM, for distribution and installation and execution on another computer. 
     Referring to  FIG. 11 , a flowchart of a method according to an embodiment of the invention is shown. In  900 , a text to have a priority thereof assigned is received. The text can be an email message, or any other type of text; the invention is not so limited. In  902 , the priority of the text is generated, based on a text classifier, as has been described. Thus, in one embodiment,  902  includes initially training and continually training the text classifier, as has been described. 
     The priority of the text is then output in  904 . In one embodiment, as indicated in  FIG. 11 , this can include  906 ,  908 ,  910 ,  912  and  914 ; however, the invention is not so limited. In  906 , an expected loss of non-review of the text at a current time t is determined—in one embodiment, by also considering the expected loss of now-review of the text at a future time, based on the assumption that ultimately the user will review the text him or herself, without being alerted, as has been described. In  908 , an expected cost of alerting is determined, as has also been described. If the loss is greater than the cost in  910 , then no alert is made at the time t, and the method proceeds back to  906 , to redetermine the cost-benefit analysis, at a new current time t. This is done because as time progresses, the expected loss may at some point outweigh the alert cost, such that the calculus in  910  changes. Upon the expected loss outweighing the alert cost, then an alert to the user is performed in  914 , as has been described. 
     In one embodiment, the output of the alert is performed as is now described. A user is alerted on an electronic device based on an alert criteria, which indicates when the user should be alerted of a prioritized text. Alert criteria that can be used in conjunction with embodiments of the invention is not limited by the invention; however, in one embodiment, the alert criteria is as described in a further section of the detailed description. The electronic device on which the user is alerted can in one embodiment be a pager or a cellular telephone; however, the invention is not so limited. 
     In one embodiment, the method alerts a user on an electronic device, such as a pager or a cellular phone, based on an alert criteria that can be made sensitive to information about the location, inferred task, and focus of attention of the user. Such information can be inferred under uncertainty or can be accessed directly from online information sources. One embodiment makes use of information from an online calendar to control the criteria used to make decisions about relaying information to a mobile device. 
     Referring next to  FIG. 12 , a diagram of a system according to an embodiment of the invention is shown. The system includes a program  950  and a text classifier  952 . Each of the program  950  and the classifier  952  include a computer program executed by a processor of a computer from a computer-readable medium thereof, in one embodiment. However, the invention is not so limited. 
     The program  950  generates a text for input into the text classifier  952 . In one embodiment, the program includes an electronic mail program that receives email, which then serve as the text. The text classifier  952 , based on the text, generates a priority thereof, as has been described. In one embodiment, the text classifier  952  is a Bayesian text classifier, while in another embodiment, it is a Support Vector Machine classifier. The priority of the text output by the text classifier  952  can then be used in further conjunction with a cost-benefit analysis, as has been described, to effectuate further output and/or alerting based thereon, as has been described. The invention is not so limited, however. 
     Referring next to  FIG. 13 , a diagram of a system according to another embodiment of the invention is shown. The system of  FIG. 13  includes an additional component, an alert mechanism  970 . Not shown in  FIG. 13  are the program  950  and the text classifier  952 ; however, the alert mechanism  970  is operatively and/or communicatively coupled to the latter. In one embodiment, the mechanism  970  includes a computer program executed by a processor of a computer from a computer-readable medium thereof, but the invention is not so limited. 
     As shown in  FIG. 13 , the alert mechanism  970  is communicatively coupled to the Internet  972 , which is the network by which the alert mechanism  970  contacts an electronic device to alert the user to a prioritized text, based on an alert criteria, in one embodiment. The network is not limited to the Internet  972 , however. Thus, the alert mechanism  970  is able to alert the user of a prioritized text via contacting a pager  974 , or a cellular phone  976 , or other electronic devices capable of receiving information from over a network such as the Internet  972 , and which are not shown in  FIG. 13 . The invention is not limited as to a particular alert criteria, although in one embodiment, the alert criteria is as described in the next section of the detailed description. 
     Alert Criteria 
     In this section of the detailed description, an alert criteria according to one embodiment of the invention is described. The alert criteria is the criteria that governs when and how a user is alerted to a prioritized text. The alert criteria is described with reference to  FIG. 14 , which is a diagram of a user interface via which alert criteria options can be modified, according to one embodiment of the invention. 
     Referring now to  FIG. 14 , in text entry box  980 , the user is able to enter the email address of a pager or a cellular phone on which the user would like to be notified of prioritized text. As known within the art, pagers and cellular phones are available that allow for paging by emailing text to an email address assigned to the pager or cellular phone. For example, as shown in  FIG. 14 , the device has an email address 4255555555@mobile.phoneco.net, where 4255555555 corresponds to the phone number of the cellular phone or the pager number of the pager, as provided by the phone company “phoneco.” 
     It is noted that the alert criteria of  FIG. 14  specifically relates to new email messages, but that the invention is not so limited. Three alert criteria are specifically shown in  FIG. 14 , and are referred to as options  982 ,  984  and  986 . The options are not mutually exclusive, however. That is, the user can select one, two, or all three of the options  982 ,  984  and  986 . 
     In the option  982 , the user is able to specify that the electronic device should be contacted if a new email is received that has a priority greater than a predetermined threshold, and the user has been away from the computer for more than a predetermined amount of time. As shown in  FIG. 14 , the predetermined threshold is a priority of 85, while the predetermined amount of time is 75 minutes. Thus, if it is determined that the priority of an email message is greater than 85, and that the user has been away from the computer for more than 75 minutes, then the user&#39;s electronic device will be alerted, consistent with the other options  984  and/or  986  if selected. 
     In the option  984 , the user is able to specify that the electronic device should be contacted only when the current time is within a predetermined range of times. As shown in  FIG. 14 , the predetermined range of times is between 8:15 a.m. and 7:30 p.m. Thus, if it is determined that the current time is between 8:15 a.m. and 7:30 p.m., then the user&#39;s electronic device will be alerted, consistent with the other options  982  and/or  986  if selected. 
     In the option  986 , the user is able to specific that if the user is in a meeting—for example, as determined by examining a schedule of the user—then the user should only be notified if the priority is greater than a predetermined meeting threshold. In general, this meeting threshold is desirably greater than the threshold specified in the option  982 —the purpose of this greater threshold is to indicate that the user is receptive to notification of email messages greater than a particular priority in usual circumstances, but that the user is receptive to notification of email messages during meetings only if they have a priority that is unusually great. As shown in  FIG. 14 , then, the predetermined meeting threshold is a priority of 95, which is higher than the predetermined threshold of 85 in the option  982 . Thus, if it is determined that the user is in a meeting, and a message is received having a threshold greater than 95, then the user is alerted via his or her electronic device. 
     EXAMPLE EMBODIMENTS 
     In one embodiment, a computer-implemented method comprises: receiving a text; 
     generating a priority of the text based on a text classifier; and, alerting a user on an electronic device based on an alert criteria. 
     In an embodiment, the alert criteria is sensitive to information about location, inferred task, and focus of attention of the user. 
     In an embodiment, the information is inferred under uncertainty. 
     In an embodiment, the information is accessed directly from online information sources. 
     In an embodiment, the online information sources comprises an online calendar. 
     In an embodiment, the receiving a text comprises receiving an email. 
     In an embodiment, the alerting a user on an electronic device comprises alerting the user on the electronic device comprising a pager. 
     In an embodiment, the alerting a user on an electronic device comprises alerting the user on the electronic device comprising a cellular phone. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether the priority of the text is greater than a predetermined threshold; and, alerting the user upon determining that the priority of the text is greater than the predetermined threshold. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether the priority of the text is greater than a predetermined threshold; determining whether the user has been away for more than a predetermined amount of time; and, upon determining that the priority of the text is greater than the predetermined threshold and that the user has been away for more than the predetermined amount of time, alerting the user. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether a current time is within a predetermined range of times; and, upon determining that the current time is within the predetermined range of times, alerting the user. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether the user is in a meeting; upon determining that the user is in a meeting, determining whether the priority is greater than a predetermined meeting threshold; and, upon determining that the priority is greater than the predetermined meeting threshold, alerting the user. 
     In another embodiment, a computer-implemented method comprises: training a text classifier comprising one of a Bayesian classifier and a support-vector machine classifier; receiving a text comprising an email; generating a priority of the text based on the text classifier; and, alerting a user on an electronic device based on an alert criteria. 
     In an embodiment, the alerting a user on an electronic device comprises alerting the user on the electronic device comprising one of a pager and a cellular phone. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether the priority of the text is greater than a predetermined threshold; and, alerting the user upon determining that the priority of the text is greater than the predetermined threshold. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether the priority of the text is greater than a predetermined threshold; determining whether the user has been away for more than a predetermined amount of time; and, upon determining that the priority of the text is greater than the predetermined threshold and that the user has been away for more than the predetermined amount of time, alerting the user. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether the priority of the text is greater than a predetermined threshold; determining whether the user has been away for more than a predetermined amount of time; determining whether a current time is within a predetermined range of times; and, upon determining that the priority of the text is greater than the predetermined threshold, that the user has been away for more than the predetermined amount of time, and that the current time is within the predetermined range of times, alerting the user. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether the user is in a meeting; upon determining that the user is in a meeting, determining whether the priority is greater than a predetermined meeting threshold; and, upon determining that the priority is greater than the predetermined meeting threshold, alerting the user. 
     In another embodiment, a machine-readable medium has instructions stored thereon for execution by a processor to perform a method comprising: receiving a text; generating a priority of the text based on a text classifier; and, alerting a user on an electronic device based on an alert criteria. 
     In an embodiment, the receiving a text comprises receiving an email. 
     In an embodiment, the alerting a user on an electronic device comprises alerting the user on the electronic device comprising a pager. 
     In an embodiment, the alerting a user on an electronic device comprises alerting the user on the electronic device comprising a cellular phone. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether the priority of the text is greater than a predetermined threshold; and, alerting the user upon determining that the priority of the text is greater than the predetermined threshold. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether the priority of the text is greater than a predetermined threshold; determining whether the user has been away for more than a predetermined amount of time; and, upon determining that the priority of the text is greater than the predetermined threshold and that the user has been away for more than the predetermined amount of time, alerting the user. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether a current time is within a predetermined range of times; and, upon determining that the current time is within the predetermined range of times, alerting the user. 
     In an embodiment, the alerting a user on an electronic device based on an alert criteria comprises: determining whether the user is in a meeting; upon determining that the user is in a meeting, determining whether the priority is greater than a predetermined meeting threshold; and, upon determining that the priority is greater than the predetermined meeting threshold, alerting the user. 
     In another embodiment, a computerized system comprises: a program to generate a text; a text classifier to generate a priority of the text; and, an alert mechanism to alert a user on an electronic device based on an alert criteria. 
     In an embodiment, the program comprises an electronic mail program to receive an electronic mail as the text. 
     In an embodiment, the text classifier comprises a Bayesian text classifier. 
     In an embodiment, the text classifier comprises a support-vector-machine classifier. 
     In an embodiment, the electronic device comprises one of a pager and a cellular phone. 
     In an embodiment, the alert criteria comprises a determination of whether the priority of the text is greater than a predetermined threshold. 
     In an embodiment, the alert criteria comprises a determination of whether the priority of the text is greater than a predetermined threshold and whether the user has been away for more than a predetermined amount of time. 
     In an embodiment, the alert criteria comprises a determination of whether a current time is within a predetermined range of times. 
     In an embodiment, the alert criteria comprises a determination of whether the user is in a meeting and whether the priority is greater than a predetermined meeting threshold. 
     In an embodiment, at least one of the alert mechanism, the program and the text classifier comprise a computer program executed by a processor from a computer-readable medium. 
     CONCLUSION 
     Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that any arrangement which is calculated to achieve the same purpose may be substituted for the specific embodiments shown. This application is intended to cover any adaptations or variations of the present invention. Therefore, it is manifestly intended that this invention be limited only by the following claims and equivalents thereof