Which phase of the Plan-Do-Check-Act cycle involves implementing the planned changes?

• A. PLAN
• B. CHECK
• C. DO
• D. ACT

Answer: (C)

The phase that puts the plan into action and carries out the changes is the Do phase. After you’ve designed what needs to be changed in Plan, this step is where you actually implement those changes in real conditions, run the new process, or run a pilot. During Do you execute the tasks, train people if needed, and collect initial data on how the change performs. This execution is what creates the results you’ll later evaluate in Check and then refine in Act. For example, if the plan is to streamline a workflow, during Do you implement the new steps and monitor how they work in practice. Plan focuses on what will be done, Check looks at what happened, and Act decides what to adjust and standardize.