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In this context, in their book Accelerate: The Science of Lean Software and DevOps, authors Dr. front mission 4 walkthrough Nicole Forsgren, Jez Humble, and Gene Kim make a strong case for measuring software development performance by using only 4 key metrics: Deployment Frequency (DF), Lead Time to Changes (LTTC), Mean Time To Recovery (MTTR) and Change Failure Rate (CFR