MOSA (Modular Open Systems Approach)

MOSA (Modular Open Systems Approach) is a technical and acquisition strategy that promotes designing systems with modular architectures and open, standardized interfaces. It enables components to be independently developed, replaced, and upgraded, improving flexibility and competition.

Widely developed in defense programs, MOSA combines engineering practices with business and contractual principles to reduce costs, accelerate technology integration, and support long-term system evolution and interoperability across complex environments.