<Li> 12207 - 2008 - ISO / IEC / IEEE Standard for Systems and Software Engineering--Software Life Cycle Processes. 2008 . doi: 10.1109 / IEEESTD. 2008.4475826 . ISBN 978 - 0 - 7381 - 5663 - 7 . </Li> <Li> 12207.0 - 1996 - IEEE / EIA Standard Industry Implementation of International Standard ISO / IEC 12207: 1995 (ISO / IEC 12207) Standard for Information Technology Software Life Cycle Processes. 1998 . doi: 10.1109 / IEEESTD. 1998.88083 . ISBN 1 - 55937 - 977 - 4 . </Li> <Li> 12207.1 - 1997 - Industry implementation of International Standard ISO / IEC 12207: 1995 . (ISO / IEC 12207) standard for information technology - software life cycle processes - life cycle data . 1998 . doi: 10.1109 / IEEESTD. 1998.86377 . ISBN 1 - 55937 - 990 - 1 . </Li> <Li> 12207.2 - 1997 - Industry implementation of International Standard ISO / IEC 12207: 1995 . (ISO / IEC 12207 standard for information technology - software life cycle processes - implementation considerations . 1998 . doi: 10.1109 / IEEESTD. 1998.86378 . ISBN 1 - 55937 - 991 - X . </Li>

What are the different classes of ieee 12207 standards