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A formal or informal methodology for designing, creating, and maintaining software (including code built into hardware).
NIST SP 800-218 under Software Development Life Cycle
The scope of activities associated with a system, encompassing the system’s initiation, development and acquisition, implementation, operation and maintenance, and ultimately its disposal that instigates another system initiation.
NISTIR 7622 under System Development Life Cycle from CNSSI 4009, NIST SP 800-34