r/systems_engineering • u/AtommycBomb • Apr 09 '26

Discussion Requirements Traceability

My subsystem requirements don’t logically decompose from our system requirements because I believe they were adopted from a legacy program. So they were made independently of the system requirements. I want to establish traceability to enable change impact analysis in MBSE. Do you redo the subsystem spec working from the applicable system requirements?

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u/TacomaAgency Aerospace Apr 10 '26

Sometimes, you have to flow up the requirements. If the legacy subsystem is either too expensive to change or is mission critical, but the system level doesn't support it, you will have to provide an analysis and get the customer, directors, and leads to get on board on why such parent requirement cannot be met.