1. ISO/IEC 14143–1: Information technology - Software measurement - Functional size measurement - Part 1: Definition of concepts. ISO/IEC JTC 1/SC 7, Geneva, Switzerland (2007)
2. ISO/IEC Guide 99: International vocabulary of metrology – Basic and general concepts and associated terms (VIM). TC/SC: ISO/TMBG, Geneva, Switzerland (2007)
3. ISO/IEC CD Guide 98-3; Evaluation of measurement data - Part 3: Guide to uncertainty in measurement (GUM). TC/SC: ISO/TMBG, Geneva, Switzerland (2015)
4. ISO/IEC 19761:2019: Software engineering - COSMIC: a functional size measurement method. ISO/IEC JTC 1/SC 7, Geneva, Switzerland (2019)
5. Deming, W.E.: The Essential Deming: Leadership Principles from the Father of Quality. Mc Graw Hill, New York (2012).Orsini, J.N. (ed.)