This European Standard specifies the requirements and statements applicable to materials, mechanical parts and processes to satisfy the mission performance requirements. This standard also specifies the documentation requirements and the procedures relevant to obtaining approval for the use of materials, mechanical parts and processes in the fabrication of space systems and associated equipment. This standard covers the following: - management, including organization, reviews, acceptance status and documentation control; - selection criteria and rules; - evaluation, validation and qualification, or verification testing; - procurement and receiving inspection; - utilization criteria and rules. The relationship between activities and programme phases is defined in Annex E. The provisions of this standard apply to all actors involved at all levels in the production of space systems. These can include manned and unmanned spacecraft, launchers, satellites, payloads, experiments, electrical ground support equipment, mechanical ground support equipment, and their corresponding organizations. This standard may be tailored for the specific characteristics and constraints of a space project in conformance with ECSS-S-ST-00.