PDCA

PDCA (plan–do–check–act) is an iterative four-step management process typically used in business. It is also known as the Deming circle/cycle/wheel, Shewhart cycle, control circle/cycle, or plan–do–study–act (PDSA).
Meaning

The PDCA cycle^[1]

PDCA is a successive cycle which starts off small to test potential effects on processes, but then gradually leads to larger and more targeted change. Plan, Do, Check, Act are the four components of Work bench in Software testing.

PLAN

Establish the objectives and processes necessary to deliver results in accordance with the expected output. By making the expected output the focus, it differs from other techniques in that the completeness and accuracy of the specification is also part of the improvement.

DO 

Implement the new processes. Often on a small scale if possible, to test possible effects.

CHECK 

Measure the new processes and compare the results against the expected results to ascertain any differences.

ACT 

Analyze the differences to determine their cause. Each will be part of either one or more of the P-D-C-A steps. Determine where to apply changes that will include improvement. When a pass through these four steps does not result in the need to improve, refine the scope to which PDCA is applied until there is a plan that involves improvement.