ISO/IEC 25051:2005 defines quality requirements for COTS software products. A COTS software product includes the product description, the user documentation, and the software contained on a computer sensible media. The quality requirements, functionality, reliability, usability, efficiency, maintainability, portability, and quality in use are consistent with the definitions of SQuaRE.

In addition to the quality requirements, ISO/IEC 25051:2005 also defines requirements for test documentation. The test documentation purpose is to demonstrate the conformity of the software with the requirements. The documentation contains a test plan, the description of the tests cases, and the tests results.

ISO/IEC 25051:2005 can be used by suppliers, certification bodies, testing laboratories, accreditation bodies, regulatory authorities and acquirers.