PDCA stands for Plan Do Check Adjust. It can also stand for Plan Do Check Act or Plan do Study Act. It is a rapid improvement method based on testing a potential countermeasure in four quick steps.
Plan: Plan or outline a problem.
Do: Do or apply countermeasure to address root cause.
Check: Check or assess if the problem is fixed.
Adjust: Adjust or fine tune the fix.
PDCA is a method developed by Dr. Deming that favors trial and error over extensive planning and trying for perfection up front with the assumption the each test allows for essential fine tuning. PDCA is often paired with A3 Documentation.