Situation awareness, or SA, is the perception of environmental elements within a volume of time and space, the comprehension of their meaning, and the projection of their status in the near future. It is also a field of study concerned with perception of the environment critical to decision-makers in complex, dynamic areas from
aviation, air traffic control, power plant operations, military command and control— to more ordinary but nevertheless complex tasks such as driving an automobile or motorcycle.
Situation awareness (SA) involves being aware of what is happening around you to understand how information, events, and your own actions will impact your goals and objectives, both now and in the near future. Lacking SA or having inadequate SA has been identified as one of the primary factors in
accidentsattributed to human error(e.g., Hartel, Smith, & Prince, 1991; Merket, Bergondy, & Cuevas-Mesa, 1997; Nullmeyer, Stella, Montijo, & Harden, 2005). Thus, SA is especially important in work domains where the information flow can be quite high and poor decisions may lead to serious consequences (e.g., piloting an airplane, functioning as a soldier, or treating critically ill or injured patients).
Having complete, accurate and up-to-the-minute SA is essential where technological and situational complexity on the human decision-maker are a concern. SA has been recognized as a critical, yet often elusive, foundation for successful decision-making across a broad range of complex and dynamic systems, including
aviationand air traffic control(e.g., Nullmeyer, Stella, Montijo, & Harden 2005), emergency response and military command and controloperations (e.g., Blandford & Wong 2004; Gorman, Cooke, & Winner 2006), and offshore oil and nuclear power plant management (e.g., Flin & O’Connor, 2001).
Although numerous definitions of SA have been proposed, Endsley’s definition (1995b), "the perception of elements in the environment within a volume of time and space, the comprehension of their meaning, and the projection of their status in the near future," is firmly established and widely accepted. While some definitions are specific to the environment from which they were adapted, Endsley’s definition is applicable across multiple task domains. Several other definitions of SA have been suggested, generally restating the same themes:
*“accessibility of a comprehensive and coherent situation representation which is continuously being updated in accordance with the results of recurrent situation assessments” (Sarter & Woods, 1991)
*"the combining of new information with existing
knowledgein working memoryand the development of a composite picture of the situation along with projections of future status and subsequent decisions as to appropriate courses of action to take" (Fracker, 1991b)
*"the continuous extraction of environmental information along with integration of this information with previous knowledge to form a coherent mental picture, and the end use of that mental picture in directing further
perceptionand anticipating future need" (Dominguez, Vidulich, Vogel, & McMillan, 1994)
consciousnessthat has as its products knowledge about a dynamic task environment and directed action within that environment” (Smith & Hancock, 1995)
*"the ability to maintain a constant, clear mental picture of relevant information and the tactical situation including friendly and threat situations as well as terrain" (Dostal, 2007)
*SA is simply “knowing what is going on so you can figure out what to do” (Adam, 1993)
*“what you need to know not to be surprised” (Jeannot, Kelly, & Thompson, 2003)
*The term SA "is a shorthand description for "keeping track of what is going on around you in a complex, dynamic environment" (Moray, 2005, p. 4)
*The "aim of efficient SA is to keep the operator tightly coupled to the dynamics of the environment" (Moray, 2005, p. 4)
Although the term itself is fairly recent, the concept has roots in the history of
military theory—it is recognizable in Sun Tzu's Art of War, for instance. The term itself, can be traced also to World War I, where it was recognized as a crucial component for crews in military aircraft (Press, 1986).
Before being widely adopted by
human factorsscientists in the 1990s, the term was first used by United States Air Force(USAF) fighter aircrew returning from war in Koreaand Vietnam(see Watts, 2004). They identified having good SA as the decisive factor in air-to-air combat engagements—the "ace factor" (Spick, 1988). Survival in a dogfightwas typically a matter of observing the opponent's current move and anticipating his next move a fraction of a second before he could observe and anticipate one's own. USAF pilots also came to equate SA with the "observe" and "orient" phases of the famous observe-orient-decide-act loop ( OODA Loop) or Boyd cycle, as described by the USAF fighter ace and war theorist Col. John Boyd. In combat, the winning strategy is to "get inside" your opponent’s OODA loop, not just by making your own decisions quicker, but also by having better SA than the opponent, and even changing the situation in ways that the opponent cannot monitor or even comprehend. Losing one's own SA, in contrast, equates to being "out of the loop."
Clearly, SA has far reaching application as it is needed for individuals and teams to function effectively in their environment. Thus, we are beginning to see SA going beyond the field of
aviationand work being conducted in a wide variety of domains. Currently, the study of SA is now being examined in such diverse areas as air traffic control, nuclear power plant operation, vehicle operation and anesthesiology (Endsley, 1995b; Gaba, Howard & Small, 1995; Collier & Follesf, 1995; Bolstad, 2000, Sollenberger & Stein, 1995).
Several cognitive processes related to situation awareness are briefly described in this section. The matrix shown below (see Table 1) attempts to illustrate the relationship among some of these concepts (S. M. Fiore, personal communication, November 6, 2007). Note that "situation awareness" and "situation assessment" are more commonly discussed in complex domains such as aviation and military operations and relate more to achieving immediate tactical objectives. "Sensemaking" and achieving "understanding" are more commonly found in industry and the organizational psychology literature and often relate to achieving long-term strategic objectives.
"Related Cognitive Processes Organized by Objective and Phase"
Situation awareness is sometimes confused with the term “situational understanding.” In the context of military
command and controlapplications, situational understanding refers to the "product of applying analysis and judgment to the unit's situational awareness to determine the relationships of the factors present and form logical conclusions concerning threats to the force or mission accomplishment, opportunities for mission accomplishment, and gaps in information" (Dostal, 2007). Situational understanding is the same as Level 2 SA in the Endsley model — the comprehension of the meaning of the information as integrated with each other and in terms of the individual’s goals. It is the “so what” of the data that is perceived.
Endsley (1995b, p. 36) argues that “it is important to distinguish the term situation awareness, as a state of knowledge, from the processes used to achieve that state. These processes, which may vary widely among individuals and contexts, will be referred to as situation assessment or the process of achieving, acquiring, or maintaining SA.” Thus, in brief, "situation awareness" is viewed as "a state of knowledge," and "situation assessment" as "the processes” used to achieve that knowledge. Note that SA is not only produced by the processes of situation assessment, it also drives those same processes in a recurrent fashion. For example, one’s current awareness can determine what one pays attention to next and how one interprets the information perceived (Endsley, 2000).
Accurate mental models are one of the prerequisites for achieving SA (Endsley & Jones, 1997; Sarter & Woods, 1991). A
mental modelcan be described as a set of well-defined, highly-organized yet dynamic knowledge structures developed over time from experience (Glaser, 1989; Kozlowski, 1998). The volume of available data inherent in complex operational environments can overwhelm the capability of novice decision makers to attend, process, and integrate this information efficiently, resulting in information overload and negatively impacting their SA (Endsley, 1997). In contrast, experienced decision makers assess and interpret the current situation (Level 1 and 2 SA) and select an appropriate action based on conceptual patterns stored in their long-term memory as ‘mental models’ (Serfaty, MacMillan, Entin, & Entin, 1997). Cues in the environment activate these mental models, which in turn guide their decision making process.
Klein, Moon, and Hoffman (2006) distinguish between situation awareness and
“...situation awareness is about the knowledge state that’s achieved—either knowledge of current data elements, or inferences drawn from these data, or predictions that can be made using these inferences (Endsley, 1995b). In contrast, sensemaking is about the process of achieving these kinds of outcomes, the strategies, and the barriers encountered.” (p. 71)
sensemakingis viewed more as “a motivated, continuous effort to understand connections (which can be among people, places, and events) in order to anticipate their trajectories and act effectively” (Klein et al., 2006, p. 71) rather than the state of knowledgeunderlying situation awareness. Endsley (2004) points out that as an effortful process, sensemaking is actually considering a subset of the processes used to maintain situation awareness. In the vast majority of the cases, SA is instantaneous and effortless, proceeding from pattern recognition of key factors in the environment – “The speed of operations in activities such as sports, driving, flying and air traffic controlpractically prohibits such conscious deliberation in the majority of cases, but rather reserves it for the exceptions.” Endsley (2004) also points out that sensemaking is backward focused, forming reasons for past events, while situation awareness is typically forward looking, projecting what is likely to happen in order to inform effective decision processes.
Theoretical model of situation awareness
The most common theoretical framework of SA is provided by Dr. Mica Endsley (1995b). Endsley’s model illustrates three stages or steps of SA formation: perception, comprehension, and projection.
Perception (Level 1 SA): The first step in achieving SA is to perceive the status, attributes, and dynamics of relevant elements in the environment. Thus, Level 1 SA, the most basic level of SA, involves the processes of monitoring, cue detection, and simple recognition, which lead to an awareness of multiple situational elements (objects, events, people, systems, environmental factors) and their current states (locations, conditions, modes, actions).
Comprehension (Level 2 SA): The next step in SA formation involves a synthesis of disjointed Level 1 SA elements through the processes of pattern recognition, interpretation, and evaluation. Level 2 SA requires integrating this information to understand how it will impact upon the individual’s goals and objectives. This includes developing a comprehensive picture of the world, or of that portion of the world of concern to the individual.
Projection (Level 3 SA): The third and highest level of SA involves the ability to project the future actions of the elements in the environment. Level 3 SA is achieved through knowledge of the status and dynamics of the elements and comprehension of the situation (Levels 1 and 2 SA), and then extrapolating this information forward in time to determine how it will affect future states of the operational environment.
Endsley’s model of SA (see Figure 1 below) also illustrates several variables that can influence the development and maintenance of SA, including individual, task, and environmental factors. For example, individuals vary in their ability to acquire SA; thus, simply providing the same system and training will not ensure similar SA across different individuals. Endsley’s model shows how SA “provides the primary basis for subsequent decision making and performance in the operation of complex, dynamic systems” (Endsley, 1995a, p. 65). Although alone it cannot guarantee successful decision making, SA does support the necessary input processes (e.g., cue recognition, situation assessment, prediction) upon which good decisions are based (Artman, 2000).
SA also involves both a temporal and a spatial component. Time is an important concept in SA, as SA is a dynamic construct, changing at a tempo dictated by the actions of individuals, task characteristics, and the surrounding environment. As new inputs enter the system, the individual incorporates them into this mental representation, making changes as necessary in plans and actions in order to achieve the desired goals. SA also involves spatial knowledge about the activities and events occurring in a specific location of interest to the individual. Thus, the concept of SA includes perception, comprehension, and projection of situational information, as well as temporal and spatial components.
"Figure 1". Endsley's model of situation awareness (adapted from Endsley, 1995b).
In summary, the model consists of several key factors:
Perception, comprehension, and projection as three levels of SA,
*The role of goals and goal directed processing in directing attention and interpreting the significance of perceived information,
*The role of information salience in “grabbing” attention in a data-driven fashion, and the importance of alternating goal-driven and data-driven processing,
*The role of expectations (fed by the current model of the situation and by long-term memory stores) in directing attention and interpreting information,
*The heavy demands on limited working memory restricting SA for novices and for those in novel situations, but the tremendous advantages of mental models and pattern matching to prototypical schema that largely circumvent these limits,
*The use of mental models for providing a means for integrating different bits of information and comprehending its meaning (relevant to goals) and for allowing people to make useful projections of likely future events and states,
*Pattern matching to
schema- prototypical states of the mental model– that provides rapid retrieval of comprehension and projection relevant to the recognized situation and in many cases single-step retrieval of appropriate actions for the situation.
For a more complete description of the model, see Endsley (1995b) and Endsley (2004). See also Endsley (2000) for a review of other models of SA.
Situation awareness in team operations
In many systems and
organizations, people work not just as individuals, but as members of a team. Thus, it is necessary to consider the SA of not just individual team members, but also the SA of the team as a whole. To begin to understand what is needed for SA within teams, it is first necessary to clearly define what constitutes a team. A team is not just any group of individuals; rather teams have a few defining characteristics. As defined by Salas et al (1992), a team is:
"a distinguishable set of two or more people who interact dynamically, interdependently and adaptively toward a common and valued goal/objective/mission, who have each been assigned specific roles or functions to perform, and who have a limited life span of membership."
Team SA is defined as “"the degree to which every team member possesses the SA required for his or her responsibilities"” (Endsley, 1995b, p. 39; see also Endsley, 1989). The success or failure of a team depends on the success or failure of each of its team members. If any one of the team members has poor SA, it can lead to a critical error in performance that can undermine the success of the entire team. By this definition, each team member needs to have a high level of SA on those factors "that are relevant for his or her job". It is not sufficient for one member of the team to be aware of critical information if the team member who needs that information is not aware.
In a team, each member has a subgoal pertinent to his/her specific role that feeds into the overall team goal. Associated with each member's subgoal are a set of SA elements about which he/she is concerned. Team SA, therefore, can be represented as shown in Figure 2. As the members of a team are essentially interdependent in meeting the overall team goal, some overlap between each member’s subgoal and their SA requirements will be present. It is this subset of information that constitutes much of team coordination. That coordination may occur as a verbal exchange, a duplication of displayed information, or by some other means.
"Figure 2". Team SA can be determined by examining the goals and SA requirements of all team members (adapted from Endsley & Jones, 1997, 2001).
Shared situation awareness can be defined as "the degree to which team members possess the same SA on shared SA requirements" (Endsley & Jones, 1997, p. 47; 2001, p. 48). As implied by this definition, there are information requirements that are relevant to multiple team members. A major part of teamwork involves the area where these SA requirements overlap — the shared SA requirements that exist as a function of the essential interdependency of the team members. In a poorly functioning team, two or more members may have different assessments on these shared SA requirements and thus behave in an uncoordinated or even counter-productive fashion. Yet in a smoothly functioning team, each team member shares a common understanding of what is happening on those SA elements that are common — "shared SA". Thus, shared SA refers to the overlap between the SA requirements of the team members, as presented in Figure 3. As depicted by the clear areas of the figure, not all information needs to be shared. Clearly, each team member is aware of much that is not pertinent to the others on the team. Sharing every detail of each person's job would only create a great deal of “noise” to sort through to get needed information. It is only that information which is relevant to the SA requirements of each team member that is needed.
"Figure 3". Shared SA Requirements (adapted from Endsley & Jones, 1997; 2001).
Team SA model
The situation awareness of the team as a whole, therefore, is dependent upon both (1) a high level of SA among individual team members for the aspects of the situation necessary for their job; and (2) a high level of shared SA between team members, providing an accurate common operating picture of those aspects of the situation common to the needs of each member (Endsley & Jones, 2001). Endsley and Jones (1997; 2001) describe a model of team situation awareness as a means of conceptualizing how teams develop high levels of shared SA across members (see Figure 4). Each of these four factors — requirements, devices, mechanisms and processes — act to help build team and shared SA.
Figure 4. Model of team situation awareness (adapted from Endsley & Jones, 2001).
"1. Team SA Requirements" - the degree to which the team members know which information needs to be shared, including their higher level assessments and projections (which are usually not otherwise available to fellow team members), and information on team members' task status and current capabilities.
"2. Team SA Devices" - the devices available for sharing this information, which can include direct communication (both verbal and non-verbal), shared displays (e.g., visual or audio displays, or tactile devices), or a shared environment. As non-verbal communication, such as gestures and display of local artifacts, and a shared environment are usually not available in distributed teams, this places far more emphasis on verbal communication and communication technologies for creating shared information displays.
"3. Team SA Mechanisms" - the degree to which team members possess mechanisms, such as shared mental models, which support their ability to interpret information in the same way and make accurate projections regarding each other's actions. The possession of shared mental models can greatly facilitate communication and coordination in team settings.
"4. Team SA Processes" - the degree to which team members engage in effective processes for sharing SA information which may include a group norm of questioning assumptions, checking each other for conflicting information or perceptions, setting up coordination and prioritization of tasks, and establishing contingency planning among others.
Measurement of situation awareness
While the SA construct has been widely researched, the multivariate nature of SA poses a considerable challenge to its quantification and measurement (for a detailed discussion on SA measurement, see Endsley & Garland, 2000; Fracker, 1991a; 1991b). In general, techniques vary in terms of "direct" measurement of SA (e.g., objective real-time probes or subjective questionnaires assessing perceived SA) or methods that "infer" SA based on operator behavior or performance. Direct measures are typically considered to be ‘product-oriented’ in that these techniques assess an SA outcome; inferred measures are considered to be ‘process-oriented,’ focusing on the underlying processes or mechanisms required to achieve SA (Graham & Matthews, 2000). These SA measurement approaches are further described next.
Objective measures of SA
"Objective measures" directly assess SA by comparing an individual’s perceptions of the situation or environment to some ‘ground truth’ reality. Specifically, objective measures collect data from the individual on his or her perceptions of the situation and compare them to what is actually happening to score the accuracy of their SA at a given moment in time. Thus, this type of assessment provides a direct measure of SA and does not require operators or observers to make judgments about situational knowledge on the basis of incomplete information. Objective measures can be gathered in one of three ways: real-time as the task is completed (e.g., "real-time probes" presented as open questions embedded as verbal communications during the task – Jones & Endsley, 2000), during an interruption in task performance (e.g., Situation Awareness Global Assessment Technique (SAGAT) – Endsley, 1995a), or post-test following completion of the task.
Subjective measures of SA
"Subjective measures" directly assess SA by asking individuals to rate their own or the observed SA of individuals on an anchored scale (e.g., Post-Trial Participant Subjective Situation Awareness Questionnaire (PSAQ) – Strater, Endsley, Pleban, & Matthews, 2001; Situation Awareness Rating Technique the (SART) – Taylor, 1989). Subjective measures of SA are attractive in that they are relatively straightforward and easy to administer. However, several limitations should be noted. Individuals making subjective assessments of their own SA are often unaware of information they do not know (the "
unknown unknowns"). Subjective measures also tend to be global in nature, and, as such, do not fully exploit the multivariate nature of SA to provide the detailed diagnostics available with objective measures. Nevertheless, self-ratings may be useful in that they can provide an assessment of operators’ degree of "confidence" in their SA and their own performance. Measuring how SA is "perceived" by the operator may provide information as important as the operator's "actual" SA, since errors in perceived SA quality (over-confidence or under-confidence in SA) may have just as harmful an effect on an individual's or team's decision-making as errors in their actual SA (Endsley, 1998).
Subjective estimates of an individual’s SA may also be made by experienced observers (e.g., peers, commanders, or trained external experts). These observer ratings may be somewhat superior to self-ratings of SA because more information about the true state of the environment is usually available to the observer than to the operator, who may be focused on performing the task (i.e., trained observers may have more complete knowledge of the situation). However, observers have only limited knowledge about the operator’s concept of the situation and cannot have complete insight into the mental state of the individual being evaluated. Thus, observers are forced to rely more on operators’ "observable" actions and verbalizations in order to infer their level of SA. In this case, such actions and verbalizations are best assessed using "performance" and "behavioral" measures of SA, as described next.
Performance and behavioral measures of SA
"Performance measures" ‘infer’ SA from the end result (i.e., task performance outcomes), based on the assumption that better performance indicates better SA. Common performance metrics include quantity of output or productivity level, time to perform the task or respond to an event, and the accuracy of the response or, conversely, the number of errors committed. The main advantage of performance measures is that these can be collected objectively and without disrupting task performance. However, although evidence exists to suggest a positive relation between SA and performance, this connection is probabilistic and not always direct and unequivocal (Endsley, 1995b). In other words, good SA does not always lead to good performance and poor SA does not always lead to poor performance (Endsley, 1990). Thus, performance measures should be used in conjunction with others measures of SA that directly assess this construct.
"Behavioral measures" also ‘infer’ SA from the actions that individuals choose to take, based on the assumption that good actions will follow from good SA and vice-versa. Behavioral measures rely primarily on observer ratings, and are, thus, somewhat subjective in nature. To address this limitation, observers can be asked to evaluate the degree to which individuals are carrying out actions and exhibiting behaviors that would be expected to promote the achievement of higher levels of SA (see, for example, the Situation Awareness Behaviorally Anchored Rating Scale (SABARS) – Matthews, Pleban, Endsley, & Strater, 2000; Strater et al, 2001). This approach removes some of the subjectivity associated with making judgments about an individual’s internal state of knowledge by allowing them to make judgments about SA indicators that are more readily observable.
Process indices of SA
"Process indices" examine how individuals process information in their environment, such as by analyzing communication patterns between team members or using eye tracking devices. Team communication (particularly verbal communication) supports the knowledge building and information processing that leads to SA construction (Endsley & Jones, 1997). Thus, since SA may be distributed via communication, computational linguistics and machine learning techniques can be combined with natural language analytical techniques (e.g., Latent Semantic Analysis) to create models that draw on the verbal expressions of the team to predict SA and task performance (Bolstad, Cuevas, Gonzalez, & Schneider, 2005; Bolstad, Foltz, Franzke, Cuevas, Rosenstein, & Costello, 2007). Although evidence exists to support the utility of communication analysis for predicting team SA (Foltz, Bolstad, Cuevas, Franzke, Rosenstein, & Costello, in press), time constraints and technological limitations (e.g., cost and availability of speech recording systems and speech-to-text translation software) may make this approach less practical and viable in time-pressured, fast paced operations.
Psycho-physiological measures also serve as process indices of operator SA by providing an assessment of the relationship between human performance and a corrected change in the operator’s physiology (e.g., French, Clark, Pomeroy, Seymour, & Clarke, 2007). In other words, cognitive activity is associated with changes in the operator’s physiological states. For example, the operator’s overall functional state (as assessed using psycho-physiological measures, such as electroencephalographic (
EEG) data, eyeblinks, and cardiac activity) may provide an indication as to whether the operator is sleep fatigued at one end of the continuum, or mentally overloaded at the other end (Wilson, 2000). Other psycho-physiological measures, such as event related potentials (ERP), event related desynchronization (ERD), transient heart rate (HR), and electrodermal activity (EDA), may be useful for evaluating an operator’s perception of critical environmental cues, that is, to determine if the operator has detected and perceived a task-relevant stimulus (Wilson, 2000). In addition, it is also possible to use psycho-physiological measures to monitor operators’ environmental expectancies, that is, their physiological responses to upcoming events, as a measure of their current level of SA (Wilson, 2000).
Multi-faceted approach to SA measurement
The multivariate nature of SA significantly complicates its quantification and measurement, as it is conceivable that a metric may only tap into one aspect of the operator’s SA. Further, studies have shown that different types of SA measures do not always correlate strongly with each other (cf. Durso, Truitt, Hackworth, Crutchfield, Nikolic, Moertl, Ohrt, & Manning, 1995; Endsley, Selcon, Hardiman, & Croft, 1998; Vidulich, 2000). Accordingly, rather than rely on a single approach or metric, valid and reliable measurement of SA should utilize a battery of distinct yet related measures that complement each other (e.g., Harwood, Barnett, & Wickens, 1988). Such a multi-faced approach to SA measurement capitalizes on the strengths of each measure while minimizing the limitations inherent in each.
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* "Gene Atherton", [http://www.corrections.com/news/article/18117 Situational Awareness: The Difference Between Life and Death for Corrections Officers] , Corrections Connection Network News
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