MIL-PRF-49503C (MI)
given at one time.
3.1.4.2 Learnable. The TP software shall be designed:
a. to prevent errors to the extent possible.
b. to allow easy recovery from errors.
c. to display a help message or visual indication prompt the user when they make an
input errors.
d. to provide instructions at the appropriate time and place.
e. to provide the operator with a dominant, clearly marked path through the operational
logic.
f. to reduce the demands on the operators' memory by providing "prompting"
information at appropriate times.
3.1.4.3 Controllable. The TP shall promote the sense of operator control over the TP by:
a. keeping the operator informed as to what the test program is doing.
b. keeping the operator oriented as to where the test is, what test has been completed, and
where the operator will be allowed to direct the test.
c. responding the same way to the same operator input.
d. ensuring that all system actions have a detectable cause.
3.1.4.4 Mappable. The TP shall provide routing information to the operator. It shall:
a. provide the operator instructions to get started.
b. provide clearly defined landmarks and routes.
c. provide continuity between landmarks.
d. never allow the operator to reach a "dead end" or loop, with no place to go or options
to try.
e. keep the operators aware of progress in reaching their goals.
f. support forward and backward movement through the operational logic. Backward
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