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Rules can be collected through the requirements capture exercise.

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For example the delivery date cannot be before the order date.

Checks to ascertain that only expected characters are present in a field.

The rules may be implemented through the automated facilities of a data dictionary, Data validation is intended to provide certain well-defined guarantees for fitness, accuracy, and consistency for any of various kinds of user input into an application or automated system.

Data validation rules can be defined and designed using any of various methodologies, and be deployed in any of various contexts.

The Validation rule or check system still used by many major software manufacturers was designed by an employee at Microsoft sometime between 19.

The method is to check that data follows the appropriate parameters defined by the systems analyst.

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.

This is distinct from formal verification, where the operation of a program is determined to be that which was intended, and that meets the purpose.

For example: Data type validation is customarily carried out on one or more simple data fields.

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