Continuous Improvement

Another key concept of Software QA  is the idea  of continuous improvement represented by the Plan, Do, Check, Act principle:


  • Plan: devise a plan, define the objective
  • Do: execute the plan
  • Check: check the results
  • Act: take the necessary action based on results

This cycle then repeats in  a continuous loop ensuring an on-going effort to improve the process.

When to Use Plan–Do–Check–Act:

  • As a model for continuous improvement.
  • When starting a new improvement project.
  • When developing a new or improved design of a process, product or service.
  • When defining a repetitive work process.
  • When planning data collection and analysis in order to verify and prioritize problems or root causes.
  • When implementing any change.

Plan–Do–Check–Act Procedure

  • Plan. Recognize an opportunity and plan a change.
  • Do. Test the change. Carry out a small-scale study.
  • Check. Review the test, analyze the results and identify what you’ve learned.
  • Act. Take action based on what you learned in the study step: If the change did not work, go through the cycle again with a different plan. If you were successful, incorporate what you learned from the test into wider changes. Use what you learned to plan new improvements, beginning the cycle again.

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