5.7.4 System Response
5.7.4.1 Standard Display Location
System messages should appear in standard locations.
5.7.4.2 Familiar Wording
System messages should use familiar terminology.
5.7.4.3 Periodic Feedback
When system functioning requires the user to stand-by, periodic feedback should be provided to indicate normal system operation.
5.7.4.4 Distinctive and Consistent Warnings
Warnings should be distinctive and consistent.
5.7.4.5 Informative Error Messages
When the information systems detects an error, an error message should be displayed stating the error and possible subsequent operations.
5.7.4.6 Task-Oriented Error Messages
Error messages should be appropriate to the task.
5.7.4.7 On-Line Guidance
Users should be able to request on-line guidance information regarding system capabilities, procedures, commands and abbreviations, etc..
5.7.5 Prevention/Detection/Correction of Errors
5.7.5.1 Protection from Data Loss by Interruption
When a proposed user action will interrupt a current transaction sequence, automatic means to prevent data loss should be provided.
5.7.5.2 Segregating Real from Simulated Data
When simulated data and system functions are displayed or provided, real data should be protected .
