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For example a numeric field may only allow the digits 0–9, the decimal point and perhaps a minus sign or commas.

A text field such as a personal name might disallow characters such a markup-based security attack.

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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.

These additional validity constraints may involve cross-referencing supplied data with a known look-up table or directory information service such as LDAP.

A validation process involves two distinct steps: (a) Validation Check and (b) Post-Check action.

The check step uses one or more computational rules (see section below) to determine if the data is valid.

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.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.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.Such complex processing may include the testing of conditional constraints for an entire complex data object or set of process operations within a system.

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