ISO IEC 24773-3:2021 pdf download – Software and systems engineering — Certification of software and systems engineering professionals — Part 3: Systems engineering. 5.3.2 Reference body of knowledge The reference BOK is the INCOSE Systems Engineering Handbook [2] , which describes the following knowledge areas (i.e., processes, methods and activities) in systems engineering: a) Generic Life Cycle Stages b) Agreement Processes c) Technical Processes d) Technical Management Processes e) Organizational Project Enabling Processes f) Tailoring process and Application of Systems Engineering g) Cross-Cutting Systems Engineering Methods h) Specialty Engineering Activities Refer to Annex A for elaboration of these knowledge areas....