What is the PDSA cycle and how is it used in a quality improvement project?

• A. Act, Plan, Do, Study
• B. Plan, Do, Check, Act
• C. Do, Plan, Study, Act
• D. Plan, Do, Study, Act

Answer: (D)

At its heart, the PDSA cycle is an iterative approach to testing and learning from small changes in a quality improvement project. It begins with planning the change and how you will measure its success. Then you carry out the change on a small scale. Next you study the results, analyzing data and comparing what happened to what you predicted, so you understand the actual impact and any unintended effects. Finally you act on what you’ve learned—either adopt the change, modify the plan and run another cycle, or abandon it if it didn’t work. This emphasis on learning from each cycle is what makes PDSA a powerful tool for continuous improvement.

The reason this sequence is preferred is that it centers on structured learning before making broader decisions, reducing risk and guiding evidence-based adjustments. In contrast, a version that uses a different term for the third step (such as “Check”) shifts the emphasis away from the explicit learning process that the model relies on. For example, you might pilot a new patient handoff checklist, plan the test and metrics, implement it in one unit, study the collected data on handoff time and errors, then decide whether to expand, tweak, or stop the change.