MIL-HDBK-1908B
analysis where system engineering is required. The following taxonomy is used to inventory or analyze tasks, with mission and scenario conditions stated by the procuring activity and the remaining levels dependent on the current phase of system development and purpose (e.g., gross analysis of tasks, analysis of critical tasks) for which the analysis is being conducted:
Mission. What the system is supposed to accomplish, e.g., combat reconnaissance. Scenario/conditions, 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.
Function. A broad category of activity performed by a system, e.g., transportation.
Job. The combination of all human performance required for operation and maintenance of one personnel position in a system, e.g., driver.
Duty. A set of operationally-related tasks within a given job, e.g., driving, weapon servicing, communicating, target detection, self protection, operator maintenance.
Task. A composite of related activities (perceptions, decisions, and responses) performed for an immediate purpose, written in operator/maintainer language, e.g., change a tire.
Subtask. An activity (perceptions, decisions and responses) which fulfills a portion of the immediate purpose within the task, e.g., remove lug nuts.
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."
Task element acq. See "Task analysis."
Task inventory gen. A comprehensive listing of all tasks performed by system personnel.
Task statement gen. A task statement is a description of a task. It is composed of three basic elements: (1) an action verb which states what is to be accomplished in the task, (2) an object which identifies what is to be acted upon in the task, and (3) any qualifying phrases needed to distinguish the task from related or similar activities, limit and define the scope of the task, and clearly communicate the nature of the task. The third element is often added only when needed for clarification.
Terminal uci. An input/output device used to enter and display data. Data are usually entered via a keyboard, and are usually displayed via a video screen ("soft copy") or a printer ("hard copy").
Text entry uci. Initial entry and subsequent editing of textual material, including messages.
Three-dimensional audio technology (3D audio) gen. A combination of hardware and software which manipulates a monaural audio signal in such a way as to give the illusion, when listened to via headphones, that the sound originates at a particular spatial location.
Time-weighted average level (Lavg) snv. The time-weighted sound level dBA that is
derived from the actual varying sound level of the source during a given sample time (T), Implicit in
this derivation is an exchange between sound level and time of Q dB per doubling of time. The criterion level is 85 dBA for a duration of 8 hours.
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