Page 386 - SAD bookflip

18 Input Design

Input Errors

At least eight types of data validation checks

– Sequence check

– out of order error

– Existence check

– record not found

– Data type check
– no mathematic calculation on character data

– Range check – limit check

– daily hour range is 0-24

– If validation check has MIN or MAX  Limit

– if daily hour range is > 0
– Reasonableness check

– Does the value make sense?