# Interactive electronic technical manual

An interactive electronic technical manual (IETM) is a portal to manage technical documentation. IETMs compress volumes of text into just CD-ROMs or online pages which may include sound and video, and allow readers to locate needed information far more rapidly than in paper manuals. IETMs came into widespread use in the 1990s as huge technical documentation projects for the aircraft and defense industries.

## History

In the United States, in the late 1970s, the US Military began to look at other ways to produce technical manuals. With the introduction of computer technology it was theorized that moving technical manuals to an electronic format would obtain a cost savings, allow better integration with other logistics systems and improve usability of the technical material.
Research was performed in the 1970s and 1980s by all branches of the US military to obtain information on what the goals should be for the electronic technical manuals. Early research was conducted at the Army Communicative Technology Office at Ft. Eustis, the Air Force Human Resources Laboratory (now called Armstrong Laboratory) at Wright-Patterson Air Force Base, and the David Taylor Research Center (now called Naval Surface Warfare Center, Carderock Division) in Bethesda, Maryland. Programs developed by the Navy, Navy Technical Information Presentation System (NTIPS) and the Air Force, Computer-based Maintenance Aid System (CMAS), were used along with user surveys, technological analysis and design studies to come up with the basic concepts for IETMs. Based on field tests with technicians maintaining military equipment, the tests found that performance was greatly improved and dramatic improvement occurred for inexperienced technicians. One questionnaire found that 90% of the technicians preferred electronic manuals and found them easier to use.
Other examples of the improvements from IETMs included:
* Navy - 100% of the technicians, experience and inexperienced, found a fault when using electronic material compared to 58% when the technicians used paper manuals
* Air Force - 100% fault isolation for experience and inexperienced technicians using electronic material compared to 75% success rate when using paper
Because of the positive results, the Department of Defense identified the need for standardization of the IETM development. In 1987 a joint military and commercial group was formed consisting of the Office of the Secretary of Defense Computer-assisted Acquisition and Logistics Support (OSD CALS) and Aerospace Industries Association (AIA). This group developed concepts for IETM authoring, IETM presentation and data interchange which were used as the basis for standard development. In 1989 the US Navy, Air Force and Army formed an ad-hoc group to determine the best way to create standards for IETMS. Input from the use of NTIPS and CMAS, later renamed Integrated Maintenance Information System(IMIS), were used along with input from the CALS Industry Steering Group (ISG) Paperless Technical Manual Committee, the Navy A-12 Program, The Air Force ATF Program, and the Army PMDE Program's IETM Style Guide as a starting point for a working group for IETM standards. The group came out with the first formally issued set of standards in 1992. By 1994, Senior R&D Engineer Michael Weldon, working on behalf of LORAL Corporation, developed a demonstration White Paper IETM describing the use of an IETM utilizing an eyeglass Monitor interfaced with a portable belt mounted CD Player for hands free use by technicians in the field, i.e. as when working on a tower 60 feet AGL.
The Tri-Service group came up with three standards:
* MIL-M-87268. Manuals, Interactive Electronic Technical: General Content, Style, Format, and User-Interaction Requirements For.
* MIL-D-87269. Data Base, Revisable: Interactive Electronic Technical Manuals, For The Support Of.
* MIL-Q-87270. Quality Assurance (QA) Program: Interactive Electronic Technical Manuals (IETMs) and Associated Technical Information, Requirements For.
The Tri-Service Group also came up with a roadmap that went through to 1997 for revision of the standards and the creation of documentation explaining the standards.

## Classes

The functionality of IETMs systems is broken down into six classes. But these classes are more like points in a spectrum of features with most real-world IETM products falling somewhere in between two classes.
* Type I
** Class 1 - This IETM class follows the structure and format of a printed book, with indexes and table of contents that are hyperlinked into the content of the document. This might be a scanned book with some links added.
** Class 2 - This format includes more hyperlinks than Class I, such as figures, tables and section references. A hyperlinked PDF document is the typical example. The document would be marked up with XML.
** Class 3 - The difference between Class II and Class III is analogous to the difference between PDF book and a web site. The book structure is discarded; instead the document is structured more freely following the logic of the content. The document can still be printed but it won't necessarily match the presentation on the screen. Hyperlinking throughout the document is expected. The document would be marked up with XML.
* Type II
** Class 4 - This class now expects the data to be stored in a relational database, obtaining benefits of data integrity and removal of data redundancy. Relationships in the content that are presented as hyperlinks, are mapped directly to relations in the database schema. Redundancy in the data that exists in earlier classes should be removed. The sequence of presentation is also different from earlier classes. There is no longer the concept of a static page. Content can change dynamically based on users navigation and input through the content; the content may now be user specific. It is no longer possible to print a linear format of the document.
** Class 5 - In this class the documentation is now integrated with expert systems that may influence the display of content. For example, the IETM system may aggregate data from a large number of users input, feed that to the expert system that analyzes it and then the result gets fed back to the user through the IETM system. An analogy might be Google search, where search results are improved based on analysis of large data sets of previous queries entered by users.
** Class 6 - A network model database was used. Dynamic multi-destination hyperlink system was used. Included system-oriented layers and troubleshooting, assembly and disassembly aspects. The Advanced Interactive Electronic Technical Manual (A-IETM 1992) was an R&D Augmented Reality (AR) version of this system designed to help to guide the standards used in the mark-up of the documentation - the idea being a UI-independent data stream. Maintenance in the field and training were both benefits of this system. Created for, and by, NAWCAD/IST.

## IETM Functionality Matrix

Due to the imprecise nature of the generic descriptions used in the class and level description of IETMs, IETMs are now defined using a Functionality Matrix. IETMs can have many different features and the Functionality Matrix is used as a checklist of which features are required for a particular IETM. This checklist more precisely defines what functionality an IETM has, and allows clearer communication between an IETM developer and the IETM customer. Classes and levels of IETMS are no longer regarded as acceptable descriptors of IETMs.
The IETM functionality matrix was first developed by the US Aerospace Industries Association (AIA) Product Support Committee. It is used in most US military technical data specifications as well as S1000D, the international IETM standard.
Outline of IETM
* IETM or Interactive electronic Technical Manual, as the name indicates, it is a Manual which is interactive and in the form of electronic/digital.
* Then PDF file is also electronic/digital, will that be called IETM?
* Yes, undoubtedly PDF is also IETM. It's Level 2 IETM.
* I need to give an example so that u can understand better about Levels. . Every one of us must have played digital games. In that, we need to cross various levels. The first level would be simple, the second little difficult, and 3rd level more challenging and 4th Level tough.
* Question is, why this documentation is required?
* Along with phone or vehicle or any household gadgets, we get a user manual because, in case we have any trouble while using, we can refer to the manual and resolve the issue, without connecting to OEM or service center as might not be available 24 X7.
* Hence, these documents should be in simple language and easy to navigate, and easy to reach any point in few clicks.
* The bigger the system/device the more pages are required and more variety of manuals are required. i.e. User manual, Operator manual, Maintainer manual, Spare list, and so on.
* If some fault has occurred in the system, then the operator may need to refer to more than one manual and it is very difficult to refer to multiple hard copies. Even it is not easy to refer to multiple PDFs and refer to the issue as there is no linkage between all PDFs.
* The purpose of the Manual is to guide the operator. If the manual is more dynamic that will be easy for the operator to refer and resolve the issue.
* Level 4 and to some extent Level 3 will be very handy and very fast. All the documents are converted to a database, hence searching and inter-document referring will become easier.
* I.e. a user can search for a problem and easily reach that particular page in seconds and also can see all the related topics to that topic which is being displayed.
Simple is Level 1 and advanced is Level -4 :
| LEVEL -1 | Normally scanned document | Normal PDF file |
| LEVEL -2 | Basic | PDF file with indexing, internal links between pages |
| LEVEL -3 | Intermediate | HTML/XML based Software |
| LEVEL -4 | Advanced | HTML/XML based software with advanced navigation features |
Indian Defense wants all the equipment to be delivered along with IETMs since 2014. Based on the complexity, Level 3 or Level 4 is asked in the RFQ document. Since 2018, mostly Level 4 is asked to deliver.

### What is IETM is it a document similar to PDF?

* IETM Level 1 and 2 are PDF files.
* IETM Levels 3 and 4 are not any document like MS Word or PDF file.
* IETM is a combination of Software and database. All the manuals are converted to SQL database. Using IETM Viewer, the user can access the data i.e. manuals, drawings, images, etc.
* IETM has 3 modes. User mode where users can access the documents. Admin mode where Admin can create users and track the activities of users.
* Super admin or Authoring tool, where all the manuals are converted to database using this authoring tool.

### Standards

IETMs are available in 2 standards
* INDIAN Defense Standard (JSG 0852:2001)
* European Aviation standard (S1000D)

### Indian Standard

* Government of India, Ministry of defense has framed few standards, Joint service Guide 0852:2001 and reframed in 2007.

### European Aviation standard

* It is called S1000D, mainly used in the Aviation industry
* If the RFQ or tender documents say it is IETM means, it's Indian standard only. If the end-user wants S1000D, then specifically “S1000D IETM LEVEL -4” is mentioned.