The UI Component Validation Service was created to give Windchill clients a central service to call to perform validation for actions and other components appearing in the Windchill UI. Calls to the service and interpretation of the results should be managed by many of the common components developed in release 9.0. The main responsibility for an application developer would be development of Validator classes that are called by the validation service to validate a specific action or UI component. This documentation outlines the process and best practices for authoring Validator classes.