In Software development there are four important steps, also referred to, in short, as the PDCA (Plan, Do, Check, Act) cycle.
Let's review the four steps in detail.
Plan: At this stage, youhave to establish the objectives and processes necessary to deliver results in accordance with the expected output. Clearly describe the goals and policies needed to attain the objective at this stage.
Do/Execute: At this stage, You have to implement the plan, execute the process and then make the product. Finally you have to collect the data from the below Ceck and Act steps.
Check: In this step, you have to study the actual results and compare with the expected output to ascertain any differences.
Act: Finally, you have to analyse the differences to get their route cause. And determine where to apply the changes which includes the improvement of the product.
So developers and other stakeholders of the project do the "planning and building," while testers do the check part of the cycle. Therefore, software testing is done in check part of the PDCA cyle.
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