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NIST Technical Note 1632

The Process of Human Behavior in

Fires

Erica D. Kuligowski

NIST National Institute of Standards and Technology • U.S. Department of Commerce

too

. US153

NIST Technical Note 1632

The Process of Human Behavior in

Fires

Erica D. Kuligowski

Fire Research Division

Building and Fire Research Laboratory

May 2009

$

SPATES O*

U.S. Department of Commerce

Gary Locke, Secretary

National Institute of Standards and Technology

Patrick D. Gallagher, Acting Director
Certain commercial entities, equipment, or materials may be identified in this document in order to describe an experimental procedure or concept adequately. Such . identification is not intended to imply recommendation or endorsement by the A

National Institute of Standards and Technology, nor is it intended to imply that the

entities, materials, or equipment are necessarily the best available for the purpose.

National Institute of Standards and Technology Technical Note 1632

Natl. Inst. Stand. Technol. Tech. Note 1632, 15 pages (May 2009)

CODEN: NSPUE2
Acknowledgements

Thanks to Kathleen Tierney, Liam Downey, William Grosshandler, Dennis Mileti, and Ross

Corotis for their efforts. My appreciation to Richard Peacock, Jason Averill, Anthony Hamins,

and Steve Gwynne for providing detailed and insightful suggestions.
THE PROCESS OF HUMAN BEHAVIOR IN FIRES

Erica Kuligowski

National Institute of Standards and Technology

INTRODUCTION

Evacuation models, including engineering hand calculations and computational tools, are used to calculate the time it takes to evacuate a building, which can then be used in an engineering safety

analysis. However, there is a lack of available data and theory on occupant behavior for use by evacuation

models to estimate evacuation time results and their uncertainty. In lieu of data and theory, evacuation

models (and users) make assumptions and simplifications about occupant behavior, which can

inappropriately characterize the time it actually takes to evacuate a building. In cases where assumptions

lead to evacuation estimates that are either too optimistic or too conservative, buildings and procedures can be designed with either insufficient or unnecessary (and costly) egress routes and fire protection/notification systems. A solution to this problem is to generate theory on human behavior

during evacuations from building fires that can be incorporated into evacuation models. Once this theory

is robust, validated and incorporated into evacuation models, these tools can begin to predict occupant

evacuation behavior rather than relying on the user to determine behavior before the simulation begins, as

is now the case.

In order to develop predictive theory of human behavior in fires, the factors that influence an occupant to take certain actions must be identified. Examples of actions taken during an evacuation include

information seeking, milling, preparing for evacuation, and informing others. This paper briefly outlines

the factors that influence an occupant to take actions during his/her evacuation and identifies future areas of research that are needed to develop a predictive behavioral (action-based) model of an evacuation

during a building fire. THEORY OF OCCUPANT BEHAVIOR DURING BUILDING FH*ES

Human behavior research has shown that any action performed in a situation is the result of a behavioral or decision-making process, ' rather than based on random chance or even actions resulting

directly from a change in the environment (i.e., a stimulus-response relationship). Research from

community evacuations during disasters

2 ' 3-4 and building fire evacuations

5

'

' 7 ' 8 ' 9 has shown that before

individuals performed an action, they perceived certain cues, interpreted the situation and the risk based on those cues, and then made a decision about what to do (i.e., the action) based on their interpretations.

Therefore, each action taken is influenced by this process. Also, there are certain factors that influence

each phase of the process; more specifically 1 ) factors that influence whether the individual perceives the cue (or not), 2) factors that influence what type of interpretation the individual forms about the situation

and the risk based on that cue, and 3) factors that influence the decision about an action. This behavioral

process is shown in Figure 1

.
wfe. rnase 1: rerceive cut^s; V

Phase 2: Interpret situation and risk

V

Phase 3: Make decision about action

V

Phase 4: Perform action

Cue- and occupantbased factors

Figure 1: The behavioral process of occupant response in a building fire

In a building fire, the phases and the factors that influence each action are specific to the occupants in the

building, the building itself, and the fire event. In the perception phase (Phase 1) of the behavioral process

from Figure 1 , building occupants can perceive (or receive) external physical and social cues from their

environment, including such physical cues as flames, smoke, heat, or debris and such social cues as hearing discussion, seeing others' inaction, or receiving phone calls from outside of the building.

Additionally, during this phase, occupants can perceive more complex conditions and states, such as perceived uncertainty, information overload, time pressure, and even their own thoughts or memories

from a particular event. In the interpretation phase, Phase 2, the occupant attempts to interpret the

information provided by the cues perceived during the perception phase.

10 ' 1112 During the interpretation

phase, occupants interpret or define both the situation (e.g., it is a false alarm or a very serious fire) and

the risk to themselves and/or to others. Phase 3 of the behavioral process, decision-making, involves

occupants making decisions on what to do next based on their interpretations of the situations and

risks. 1314 And, finally, in Phase 4 of the behavioral process, occupants may perform the action that they

decided upon in the decision-making phase. For a more complete version of the theory behind each phase

in the process, see reference [15].

Occupants will begin a behavioral process when presented with cues or information that interrupts their

daily routine. A new behavioral process begins each time an occupant receives new information relating

to the event, and a specific action is likely to occur based on whether the information is perceived, the

interpretation of the situation and the risk, and the decisions made regarding what to do.

CONCEPTUAL MODEL FOR EVACUATION BEHAVIOR IN BUILDING FIRES

To eventually develop a predictive behavioral model, an understanding of the factors that influence each phase of the behavioral process for building fires is required. Literature from community

disasters and building fire evacuations were collected and reviewed to identify these factors. This is a

difficult task for several reasons. First, there are both direct and indirect factors that influence each phase

of the behavioral process. Direct factors actually influence the main process in each phase, whereas

indirect factors can influence the subprocesses that take place within each phase. Second, whereas the

perception phase contains a small number of alternatives (i.e., either an individual perceives the cue or

not), the interpretation, decision-making and action phases have a large number of options which makes it very difficult to develop linkages between these phases. When presented with building fire cues, for

example, occupants have a large number of interpretations that can be made regarding the situation and

the risk (Phase 2). Additionally, occupants can perform a large number of actions (Phases 3 and 4). Whereas, if the occupant perceives a cue(s), then he/she will begin to engage in interpretation, few

studies

16 were found that effectively linked specific interpretations (Phase 2) with decisions made about

specific actions to perform (Phase 3).
This paper begins the development of a predictive behavioral model by identifying the direct factors of

influence for Phases 1 and 2 (perception and interpretation). The focus of this paper is to present the

factors that influence 1) whether a cue is perceived, 2) whether an occupant interprets the situation as a

fire, and 3) whether the occupant interprets a level of risk. In addition, the direction of influence is also

included (e.g., whether a factor increases or decreases the likelihood of the phase).

The factors of influence for Phases 1 and 2 have been categorized into two main types: occupant-based

factors and cue-based factors. Occupant-based factors include pre-event factors which are those factors possessed by the occupant prior to an event taking place, i.e., education, training, demographic

characteristics, etc.; event factors are possessed by the occupant as a function of the event. Cue-based

factors, which are inherently event factors, vary by the number of cues, the complexity of the cues (e.g.,

ambiguous, inconsistent, and too many in number), and the source or type of cue (e.g., smoke condition,

other occupants in the building, and people's actions).

Table 1 provides an overview of the influential factors for Phases 1 and 2 of the behavioral process and

their direction of influence based on data and theory from human behavior in fires, community-wide

disasters, and other types of emergencies. The table should be read in the following way: If [insert factor

here], then the likelihood of 1 ) perceiving a cue, 2) defining the situation as a fire, or 3) defining the risk

to self and/or others [insert direction of influence here - i.e., Increases or Decreases]. An example of this using the factor "Has a perceptual disability (Yes)" is the following: If an occupant has a perceptual

disability, then the likelihood of perceiving a cue decreases. A full list of references is provided for each

relationship described in Table 1 in the following text.

Table 1: An overview of influential factors for Phases 1 and 2 of the behavioral process

Factors Phase 1 Phase 2: In terpretation Perception 2a: Definition of the 2b: Definition of the

Situation as a Fire Risk to Self/Others Occupant-based pre-event factors Has experience with fires (Yes) Increases Increases Increases Has knowledge of fire/training (Yes) Increases Increases Increases Habituation with environment (Yes) Decreases * —

Has knowledge of routes (Yes) ... ... Decreases Has frequent experience with "false" alarms (Yes) ... Decreases ... Has a feeling of security in building (Yes) ... Decreases —

Has a perceptual disability (Yes) Decreases ... ... Age (Older adults) Decreases ... Increases Gender (Woman) Increases ... Increases Speaks the same language as others (Yes) Increases ... ... Has frequent interaction with family (Yes) Increases — ... Occupant-based event factors Has a higher stress/anxiety level Decreases ... Perceives a time pressure (Yes) Decreases Decreases Increases Presence of others (especially loved ones) (Yes) Decreases ... Increases Proximity to fire/Visual access (Yes) Increases ... ... Sleeping (Yes) Decreases ... ... A higher number of behavioral processes (>1

)

— Increases ... Defines situation as fire (Yes) — N/A Increases Cue-based factors A higher number of cues Mixed** Increases Increases Consistent cues (Yes) — Increases Increases Unambiguous cues (Yes) — Increases ... Social cues (others' actions) that are consistent with an — Increases Increases understanding of a fire situation (Yes)

Official source (Yes) Increases Increases —

Familiar source (Yes) ... Increases ... A higher dose of toxic gases ... Decreases ... Extreme/dense cues (Yes) Decreases ... Increases Visual/audible cues (Yes) Increases ... ... Risk information (Yes) ... Increases ...

''Areas where no research was found is marked by "—"; **Research conflicted on the direction of influence of the factor.
Phase 1: Perception

In Table 1 , research shows that both occupant- and cue-based factors influence whether a person

perceives a cue. Mileti and Sorensen provide a compilation of all of the factors that influence whether

community residents will hear a warning, many of which apply to building fires. The occupant-based pre- event factors that are shown to increase the likelihood of perception are having prior experience with

disasters and fires,

17 ' 18 ' 19,20 having some type of knowledge and/or training about fires,21 being a woman,'

22 speaking the same language as the message and others in the building,23 and having frequent

interaction with family.""

24 ' 25 On the other hand, the occupant-based pre-event factors that are shown to decrease the likelihood of perception are past experience/habituation with the environment (i.e., spending

extended hours in the same environment where the event takes place),'

26 ' 27 ' 28,29 having a perceptual

disability (i.e., a cognitive disability or even loss of any of the senses),

30,31 and being older (i.e., older

adults).'"

32 ' 33 ' 34 ' 35 ' 36 ' 37

There are also occupant-based event factors that influence perception. The factors that increase the

likelihood of perception are being located closer to the event'"

38 ' 39 ' 40 ' 41 ' 42 and having visual access of the

event,

43 ' 44 ' 45 whereas those factors that decrease the probability of an occupant perceiving a cue include

having higher levels of stress or anxiety,'

46 ' 47 perceiving time pressure," the presence of others on the floor or in the area, and being asleep""

48 ' 49 (especially if he/she is very young or very old,50 intoxicated;51 sleep

deprived, or in a deep stage of sleep

52

).

Last, research shows that there are cue-based factors that influence whether a person perceives a cue. The

cue-based factors that increase the probability of perception include cues from the fire event that are easy

to hear (audible), cues that are presented by an official source (e.g., staff, fire warden, etc.),"

53 ' 54 ' 55 and a higher number of cues;"" although if the occupant receives too many cues at the same time, this actually

decreases the likelihood of perceiving the cue (i.e., this is the reason a label of "Mixed" is assigned to this category in Table 1). The factor that is shown to decrease the likelihood of perception is the presence of

thick, dense smoke 56 ' 57 ' 58 ' 59 ' 60 that prohibits the occupant from seeing the space around him/her (labeled

in Table 1 as "Extreme/dense cues").

Phase 2a: Definition ofthe situation as afire

Occupants can interpret the situation in many ways; however, the factors that are listed in Table 1 identify those factors that influence whether an occupant interprets a building fire event as a fire event

(rather than a false alarm, an evacuation drill, etc.). The occupant-based pre-event factors that increase the

likelihood of the occupant defining the situation as a fire are having past experience with fires and having

knowledge or training on what to do during fire events .—

61 ' 62 ' 63 - 64 ' 65 - 66 On the other hand, an occupant

with frequent false alarm experience' or who feels secure/safe in their building"

67 ' 68 is less likely to accurately define the situation as a fire.

Additionally, occupant-based event factors influence whether an occupant defines the situation as a fire. First, research suggests that time pressure negatively affects the development and accuracy of an

occupant's definition of the event. Also, research shows that if the occupant is engaging in his/her first behavioral process during the evacuation (resulting in his/her first action), he/she is less likely to define

the situation as a fire, and additionally, is more likely to define the situation optimistically. In other

words, people's first inclination is to think that nothing bad is happening to them and that they do not need to act.

69 ' 70

Table 1 also shows that there are many cue-based factors that influence whether an occupant will interpret

the situation as a fire. The occupant's definition of the situation as a fire is more likely when the occupant

is presented with a higher number of cues,""

71,72 a consistent set of cues (e.g., the smoke, flames, heat, and
debris all lead to the same interpretation), nj4J5 and unambiguous cues.""*"

76 Other factors that increase

the likelihood of the occupant interpreting the situation as a fire include perceiving social cues that are

consistent with an understanding of a fire situation (e.g., hearing screams, seeing others act, etc.),"

77 ' 78

7Q 8ft 81 89 cues from official sources (e.g., the fire department),"" ' ' ' cues from familiar sources (e.g., friends,

family, etc.),""

83 and cues that provide risk information as part of the warning message.

84 On the other

hand, if occupants are exposed to certain environmental cues, such as toxic gases from smoke for a

certain period of time (e.g., CO, HCN, low 2 ), this exposure itself is likely to negatively affect his/her

cognitive abilities, including the ability to construct an accurate definition of the situation."

85 ' 86,87 Prolonged exposure may lead to incapacitation or death.

Phase 2b: Definition ofthe risk to self/others

The occupant-based pre-event factors that increase the likelihood of an occupant defining risk

include having past experiences with fires and/or knowledge/training for fires, "" being older (e.g., older

adults), and being a woman.'

88 On the other hand, one study shows that having knowledge of the

evacuation routes from a building can decrease the likelihood of an occupant interpreting risk. Also,

research identifies three occupant-based event factors that increase the likelihood of an occupant defining

risk, and those factors are time pressure (or feeling a sense of urgency),

89 the presence of loved ones

within the building (e.g. friends, family, etc.);

90 and if the occupant has already defined the situation as a

fire,'

91

it is more likely that he/she will feel risk to him/herself or to others.

Last, cue-based factors also influence an occupant's perception of risk. A higher number of cues,

92 ' 93 a

consistent set of cues,'

94 the presence of social cues that are consistent with an understanding of a fire situation;

95,96 and the presence of more extreme cues (e.g., dense smoke)"97 increase the likelihood of an

occupant defining risk to him/herself or others. CONCLUSION

Behavior during a building fire evacuation is the result of a behavioral process. Each process

begins with new cues and information from the physical and social environment. First, cues need to be

perceived, then they are interpreted, and then a decision is made as to what action (including inaction) is undertaken. During an evacuation, individuals repeat this process several times as they engage in a variety

of different activities. This paper presents the influential factors for the perception phase and a subset of

the interpretation phase of the behavioral process, however, future research, in the form of an in-depth

study of real fire events, is needed to identify the factors that influence occupants to decide to take a

specific action, and the factors that influence whether that action is ultimately performed. By identifying

the factors that have been shown to influence each phase in the behavioral process, researchers can begin

to develop a comprehensive, predictive, behavioral model for a building fire evacuation.

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