1. IEEE Std. 1061. Software Quality Metrics Methodology 1998. IEEE Std. 1061. Software Quality Metrics Methodology 1998.
2. ISO 9126. Software Product Evaluation: Quality Characteristics and Guidelines for their Use. 1991. ISO 9126. Software Product Evaluation: Quality Characteristics and Guidelines for their Use. 1991.
3. ISO/DIS 9241-11. Guidance on Usability. Ergonomic Requirements for Office Work with Visual Display Terminals (VDT). 1996. ISO/DIS 9241-11. Guidance on Usability. Ergonomic Requirements for Office Work with Visual Display Terminals (VDT). 1996.