The PDSA or Plan-Do-Study-Act continuous improvment spiral is a team oriented problem solving technique. The team focus objective is to improve the input and the output of any stage. As the PDCA, the PDSA - by Edwards Deming - are very useful techniques in product/process improvement projects.

• PLAN: what change could be desirable?
• DO: carry out the change or test preferably on small scale.
• STUDY: observe the changes of what has been done.
• ACT: study the results; what lessons was learned? What can be predicted from what was learned?

Results may indicate that at least for now, no change at all is needed.

Repeat step 1 with the new knowledge accumulated. Repeat step 2 and onward.