The basic objective of user interface is to minimize the human error during data entry.
(i) Explain the error control measures that should be incorporated into a user interface.
(ii) What are the implications of the error control measures in (i) above?
Forward error control – additional redundant information is transmitted with each character or frame so that the receiver cannot only detect when errors are present, but can also determine where the error has occurred and thus corrects it.
Feedback (backward) error control – only enough additional information is transmitted so that the receiver can identify that an error has occurred. An associated retransmission control system is then used to request that another copy of the information be sent.
Ensures data integrity during data transmission.