1. ISO/IEC 15504-1:1998 Information Technology — Software process assessment — Part 1: Concepts and introductory guide (1998)
2. ISO/IEC 15504-2:1998 Information Technology — Software process assessment — Part 2: A reference model for processes and process capability (1998)
3. ISO 9000:1987 Quality management and quality assurance standards — Guidelines for selection and use (1987)
4. ISO 9001:1987 Quality systems — Model for quality assurance in design/development, production, installation and servicing (1987)
5. ISO/IEC JTC1/SC7/WG10/N017R Requirements specification for a software process assessment standard (1993)