MACHINE DRAWING & COMPUTER GRAPHICS
208
10.2.4 Minimizing Memorization
Operations in an interface should also be structured so that they are easy to understand and to remember.
Complicated, inconsistent and abbreviated common formats lead to confusion and reduction in the effectiveness of the use of the package.
Icons are used to reduce memorizing by displaying easily recognizable shapes for various objects and actions.
10.2.5 Backup and Error Handling
A mechanism for backing up or aborting, during a sequence of operations is another common feature of an interface.
Backup can be provided in many forms. A standard undo key or command is used to cancel a single operation. A system can be backed up through several operations, allowing us to reset the system to some specified point.
Error messages are designed to help determine the cause of error. Interfaces attempt to minimize error possibilities by anticipating certain actions that could lead to an error.
10.2.6 Feedback
As each input is received, the system normally provides some type of response.
An object is highlighted, an icon appears, or a message is displayed.
If processing cannot be completed within a few seconds, several feedback messages might be displayed to keep us informed of the progress of the system.
With function keys, feedback can be given as an audible click or by lighting up the key that has been pressed. Other feedback methods include highlighting, blinking and color changes.
Audio feedback has the advantage that it does not use up screen space and we do not need to take attention from the work area to receive the message.
FOR MORE DETAILS VISIT US ON WWW.IMTSINSTITUTE.COM OR CALL ON +91-9999554621