Response Times

ISSUE:

Requiring responses in less than 5 seconds, or a release of a key in less than 1.5 seconds may be problematic for individuals with mobility impairments. Similarly, a short time-interval for acquiring information to which a response is to be made may be inaccessible to persons using screen-readers, screen magnification applications or users with cognitive impairments.

STANDARD:

• Important messages shall be displayed until the user closes them.



• The user shall be alerted when a process is about to time-out. One or more of the following options shall be provided:
  
  
  • A method for indicating that more time is needed.
  
  
  • A method for the user to adjust the time interval.
  
  
  • A non-time dependent alternative.

Programmer's Note: Response latencies can be tied to related settings, which the user can customize through the Windows Control Panel. For example, use SystemParametersInfo with the value SPI_GETMOUSEHOVERTIME or SPI_GETMENUSHOWDELAY or SPI_GETSCREENSAVETIMEOUT.