Specifications

MIL-STD-1472E
TABLE XXVIII. Dialogue type versus user training and system response
Dialomm Tvpe
Question and Answer
Menu Selection
Form Filling
Function Keys
Natural/Query Language
Command Language
Graphic Interaction
Rcauired User Tr-
None
None
Moderate
Moderate
Moderate
High
High
Tolerable Soeed of Svs~
Moderate (0.5 to less than 2 sees)
Very Fast (less than 0.2 SCCS)
Slow (greater than 2 sees)
Very Fast (less than 0.2 sees)
Fast (0.2 to less than 0.5 SCC)
Moderate/Slow (0.5 to greater than 2 sees)
Very Fast (less than 0.2 see)
5.15.2.3.2 Standardization. Fixed function keys should be common throughout the system.
5.15.2.3.3 Functional consistence. Once a key has been assigned a given function, it should
not be reassigned to a different function for a given user.
5.15.2.3.4 Availability.
Fixed function keys should be selected to control functions that are
continuously available; i.e., lockout of fixed function keys shall be tn.itirnized- At any step in a
transaction sequence, however, function keys, not used for current inputs, should be temporarily
disabled under computer control. Mechanical overlays should not be used for this purpose.
5.15.2.3.5 Non-active keM
. Non-active fixed function keys should be replaced by a bhmk key.
5.15.2.3.6 Grouping. Fixed function keys
shail be logically grouped and shall be phacai in
distinctive locations on the keyboard.
5.15.2.3.7 Actu@. Except when used to toggle between two opposing states, a fixed
function key should require only a single actuation to accomplish its function.
5.15.2.3.8 Feedb~. When fixed function key activation does not result in an immediately
observable natural response, the user shall be given an indication of system acknowledgment.
5.15.2.3.9 ~ Key assignments shall be displayed at all times, preferably by
direct marking. Where abbreviations are necessary, standard abbreviations (e.g., MIISI’D-783)
should be use~.
5.15.2.4 Variable function kevs.
5,15 ‘24.1 (ISC.Varitible f’unctionkeys may be
entry of conlro] functions.
5.15.2.4.2 $CItus di,~
‘II. When the effect of a
I)LLll>pld}cd.
used for programmable menu selection and
function key varies. the status of the key shall