ISO/IEC TR 29106:2007+A1:2012+A2:2019 acts as an introduction to the concepts used to develop the MICE environmental classification system used in cabling standards developed by ISO/IEC. It also gives the sources used to define the boundaries of MICE classifications. This consolidated version consists of the first edition (2007), its amendment 1 (2012) and its amendment 2 (2019). Therefore, no need to order amendment in addition to this publication.