Improve (DMAIC Phase)

Fourth phase of Six Sigma DMAIC where solutions are developed, tested, and implemented to address verified root causes. May use Design of Experiments (DOE) to optimize multiple factors simultaneously. Solutions are piloted on small scale before full deployment to minimize risk. Includes cost-benefit analysis and risk assessment (FMEA). Answers 'What changes will eliminate the root causes?' Similar to A3 Countermeasures and Implementation Plan but with more rigorous experimentation and validation requirements before rollout.