The Standard DIN EN ISO/IEC 17025 "Generell requirements for the competence of testing and calibration laborities" and DIN EN 45004 "Generell criteria for the operation of various types of bodies performing inspection" contains all the requirements for the competent operation of such bodies. The demonstration of competence results from accreditation. The Deutsche Akkreditierungssystem Prufwesen DAP undertakes such demonstrations of competence by using proved rules.