This Standard establishes the requirements for the verification of a space system product. It defines the fundamental concepts of the verification process@ the criteria for defining the verification strategy and specifies the requirements for the implementation of the verification programme. It includes also the list of the expected documentation (i.e. Document requirements definitions@ DRDs). This Standard is intended to apply to different products at different levels from a single equipment to the overall system. Discipline related verification aspects are complemented in Standards specific to those disciplines. For verification process for SW the following standards are considered fully sufficient for development of these items: ? ECSS-E-ST-40 Space engineering ?C Software ? ECSS-Q-ST-80 Space product assurance - Software product assurance Detailed requirements for Testing are covered in the ECSS E-ST-10-03. This standard does not specifically address Validation of space products as a separate process@ since product Verification is performed against requirements that also address the suitability of the product to fulfil the needs of its intended use. As such@ Validation is achieved through the Verification process provided adequate requirements are placed on the product. It is recognised that testing and analysis also occur during the product development process@ but they are not addressed by this standard as they are not formal requirement verification activities in the sense of the customersupplier relationship. The guidelines on verification are provided in the associated handbook ECSS-EHB- 10-02A. The requirements on the systems engineering process are gathered in ECSS-EST- 10 ??System Engineering??; specific aspects of the SE process are further elaborated in dedicated standards@ in particular: ECSS-E-ST-10-06 ??Technical Specification??@ ECSS-E-ST-10-02 ??Verification?? (the present standard)@ and ECSS-E-ST-10-03 ??Testing??. These standards are based on the same principles@ process and documentation model. The applicability of each these standards can therefore not be considered in isolation from the others This standard may be tailored for the specific characteristic and constraints of a space project in conformance with ECSS-S-ST-00