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Code and cross-reference validation includes tests for data type validation, combined with one or more operations to verify that the user-supplied data is consistent with one or more external rules, requirements, or validity constraints relevant to a particular organization, context or set of underlying assumptions.

Using these data definitions, a range of software validation checks can be carried out.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.The Validation rule or check system still used by many major software manufacturers was designed by an employee at Microsoft some time between 19.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.The Post-validation action sends feedback to help enforce validation.

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