DMAIC is a structured, data informed method used to improve an existing process. The name represents five connected phases: Define, Measure, Analyze, Improve, and Control. Teams use DMAIC when a process has a measurable performance problem and the causes or best solution are not yet clear.
The five phases of DMAIC
1. Define
Clarify the problem, customer need, project scope, goal, stakeholders, and expected value. Common tools include the project charter, SIPOC, stakeholder analysis, and voice of the customer.
2. Measure
Document the current process, select meaningful measures, confirm how data will be collected, and establish a reliable baseline. Measures may include defects, cycle time, waiting time, cost, rework, or service accuracy.
3. Analyze
Use evidence to identify and verify root causes. Process maps, Pareto charts, cause and effect diagrams, 5 Whys, hypothesis tests, and failure mode analysis may be useful depending on the project and data.
4. Improve
Develop possible solutions, evaluate risk, run controlled tests or pilots, and implement changes that address verified causes. The team should compare results with the baseline and document lessons learned.
5. Control
Create monitoring, ownership, standard work, response plans, and process controls that help sustain the improvement. A control plan should explain what is measured, how often it is reviewed, who is responsible, and what action follows a warning signal.