A company has established a Personnel file and each record contains a field for the Job Grade. An entry in a record may be valid and accepted by the system if it is one of these characters, but it may not be the correct grade for the individual worker concerned.Whether a grade is correct can only be established by clerical checks or by reference to other files.For example, an experienced user may enter a well-formed string that matches the specification for a valid e-mail address, as defined in RFC 5322 but that well-formed string might not actually correspond to a resolvable domain connected to an active e-mail account.Structured validation allows for the combination of any of various basic data type validation steps, along with more complex processing.The method is to check that data falls the appropriate parameters defined by the systems analyst.
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A Validation rule is a criterion or constraint used in the process of data validation, carried out after the data has been encoded onto an input medium and involves a data vet or validation program.Data that does not conform to these rules will negatively affect business process execution.Therefore, data validation should start with business process definition and set of business rules within this process.This can only be achieved through the use of all the clerical and computer controls built into the system at the design stage.
The difference between data validity and accuracy can be illustrated with a trivial example.
Rules can be collected through the requirements capture exercise.