MIL-PRF-49503C (MI)
movement shall be restricted to multiple graphic screens or successful UUT adjustments
which allow testing to resume at the original failure.
3.1.4.5 Responsive. The TP shall provide effective, consistent, timely, and meaningful
feedback. The TP responses shall reflect what the test program is doing as well as system
responses to operator actions.
3.1.4.6 Tolerant. The TP shall facilitate easy recovery from errors. Error handling support
features such as "undo" commands, clear and constructive error messages, and help directories
shall be used to recover from errors. The TP design shall include procedural verification. This
verification shall identify instances where the operator may not have correctly performed a
procedure, and prompt the operator to check the previous procedure before the test can continue.
3.1.4.7 Flexible. The TP shall provide for ease of menu/interface upgrades in the future revision
releases based upon input from operator filed comments.
3.1.4.8 Language. Common nouns and verbs, as well as special terminology, shall be used
consistently. For example, the user shall not be told to "press" a switch in one message and "depress" it in
another.
3.1.4.9 Equipment identification. Items of equipment shall be identified only by nomenclature used in the
repair parts and special tools list (RPSTL) or in other terms specifically approved by the Government.
3.1.4.10 Abbreviations and acronyms. Information shall be displayed in plain concise text wherever
possible. Abbreviations and acronyms not peculiar to a specific system shall be from appendix A of this
document or from ASME Y14.38.
3.1.4.11 Display codes. Approved abbreviations, acronyms, or display codes shall be used where space
does not permit plain text.
3.1.4.12 Feedback. Feedback shall be provided to the operator to indicate the status of test program
processing and provide for user confidence. Feedback shall conform to the following:
a. Periodic feedback shall be provided to the operator to indicate normal system operation when
test program processing requires the operator to stand by for more than 15 seconds without
making a response.
b. The operator shall be informed at least once before the test or tests are initiated when a testing
event or a series of testing events technically prohibits interruption to inform the operator.
c. Positive indication shall be presented to the operator about the outcome of the process and the
requirements for subsequent operator actions when a process or sequence is completed or aborted
by the system or TPS.
d. Feedback shall be provided to indicate the reason for rejection and the required corrective
action if the system rejects an operator input. Feedback shall be self-explanatory or coded in a
manner clearly understood by the target audience.
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