Life Cycle Model (glossary)
A framework of processes and activities concerned with the life cycle that may be organized into stages, which also acts as a common reference for communication and understanding (ISO/IEC 15288)
ISO/IEC. 2008. Systems and Software Engineering -- System Life Cycle Processes. Geneva, Switzerland: International Organisation for Standardisation / International Electrotechnical Commissions. ISO/IEC/IEEE 15288:2008.
The life cycle models most commonly used in systems engineering are described in the Life Cycle Models article.