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Artificial environment The characteristics of the environment affected by humans.
Asymptotic learning The point at which performance does not improve with increased practice.
Complexity The number and amount of interdependencies among system.
Consensus Substantial agreement has been reached by directly and materially affected interests.
Continuous performance Performance, such as tracking or monitoring that requires constant attention over a period of time.
Defensive posture State of readiness to defend the system.
Dimensions Units of measurement, e.g., deviation from glideslope in meters.
Discrete performance Performance that has a well-defined start and end, such as switch activation or issuance of a voice command.
Discriminability Corresponds to separation of the noise and noise-plus-signal distributions.
Duty A set of operationally-related tasks within a given job, e.g., driving, weapon servicing, communicating, target detection, self protection, and operator maintenance (MIL-STD-46855).
Element The smallest logically definable unit of behavior required for completing a task or step, e.g., verify that rpm is between 4500 and 6000 (Berson and Crooks, 1976).
Function A major category of activity associated with a system or subsystem and assigned to a person or a machine or shared between a person and a machine (Berson and Crooks, 1976).
HPMHuman performance measurement.
Human factors A body of scientific facts about human characteristics. The term covers all biomedical and psychosocial considerations; it includes, but is not limited to, principles and applications in the areas of human engineering, personnel selection, training, life support, job performance aids, and human performance evaluation (MIL-STD-46855).
Human performance A measure of human functions and actions in a specified environment (MIL-STD-46855).
Job The combination of all human performance required for operation and maintenance maintenance of one personnel position in a system, e.g., driver (MIL-STD-46855).
LED Light-emitting diode.
Mission What the system is supposed to accomplish, e.g., combat reconnaissance (MIL-STD-46855).
Mission segment A piece of the mission, e.g., takeoff, landing, and enroute.
MOPP Mission oriented protection procedure.
Natural environment Weather and terrain unaffected by humans.
OJT On-the-job training.
Operational environment The characteristics related to the condition of conflict.
Payoff matrix The value of a hit and a correct rejection; the cost of a miss and a false alarm.
PSF Performance-shaping factor.
Scenario/condition Categories of factors or constraints under which the system will be expected to operate and be maintained, e.g., day/night, all weather, all terrain operation (MIL-STD-46855).
Step The activities (perceptions, decisions, and responses) that fulfill a portion of the immediate purpose within a task. Alternatively called a subtask (Berson and Crooks, 1976).
Subfunction A breakout of a function. A subfunction may later be allocated to human performance, in which case it becomes a “task”. If hardware or software will perform it, it stays a subfunction.
Subtask Activities (perceptions, decisions, and responses) which fulfill a portion of the immediate purpose within a task, e.g., remove lug nuts (MIL-STD-46855).
Support Provision of required items.
Task Composite of related activities (perceptions, decisions, and responses) performed for an immediate purpose, e.g., takeoff from an airfield (Berson and Crooks, 1976).
Task element The smallest logically and reasonably definable unit of behavior required in completing a task or subtask, e.g., apply counterclockwise torque to the lug nuts with a lug wrench (MIL-STD-46855).
Workload The relative capacity to respond (Lysaght, Hill, Dick, Plamondon, Linton, Wierwille, Zaklad, Bittner, and Wherry, 1989, p. 27).