This part of ISO 10360 specifies the acceptance tests for verifying the performance of an optical CMS (coordinate measuring system) when measuring lengths as stated by the manufacturer. It also specifies the reverification tests that enable the user to periodically reverify the performance of the optical 3D CMS. An optical 3D CMS that this standard intends to specify is a contactless area measuring sensor delivering 3D surface data in several individual single views by an optical measuring principle and transforming it into a common coordinate system. Typical optical measuring principles are pattern projection, fringe projection, and project-and-sweep a scanned line, or similar, delivering single views without assistance of external information related to position and orientation between CMS and objects to be scanned. Typical registration principle is based on a best fitting of commonly captured position information across at least two different single views either or both by using reference targets or surface features of objects to be scanned.