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Technology Readiness Level only tells part of the story of system maturation. As component technologies are developed to become part of systems, there are also integration and manufacturing issues to consider. This article improves upon the System and Integration Readiness Level concepts previously developed by B. J. Sauser et al., combines the concepts of Technology, Integration, and Manufacturing Readiness Levels, adapted for use in defense acquisition, into a single metric—System Readiness Level. This metric can then be used as an indicator to identify areas for resource allocation to enable the most efficient path to technology transition and to prevent premature system advancement.