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The characteristics of the environment affected by humans.
The point at which performance does not improve with increased practice.
The number and amount of interdependencies among system.
Substantial agreement has been reached by directly and materially affected interests.
Performance, such as tracking or monitoring that requires constant attention over a period of time.
State of readiness to defend the system.
Dimensions Units of measurement
, e.g., deviation from glideslope in meters.
Performance that has a well-defined start and end, such as switch activation or issuance of a voice command.
Corresponds to separation of the noise and noise-plus-signal distributions.
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).
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).
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).
Human performance measurement.
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).
A measure of human functions and actions in a specified environment (MIL-STD-46855).
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).
What the system is supposed to accomplish, e.g., combat reconnaissance (MIL-STD-46855).
A piece of the mission, e.g., takeoff, landing, and enroute.
Mission oriented protection procedure.
Weather and terrain unaffected by humans.
The characteristics related to the condition of conflict.
The value of a hit and a correct rejection
; the cost of a miss and a false alarm.
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).
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).
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.
Activities (perceptions, decisions, and responses) which fulfill a portion of the immediate purpose within a task, e.g., remove lug nuts (MIL-STD-46855).
Provision of required items.
Composite of related activities (perceptions, decisions, and responses) performed for an immediate purpose, e.g., takeoff from an airfield (Berson and Crooks, 1976).
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).
The relative capacity to respond (Lysaght, Hill, Dick, Plamondon, Linton, Wierwille, Zaklad, Bittner, and Wherry, 1989, p. 27).