Today we come to 3rd phase of PDCA - Check section.

In this section, once you have completed your trial, test, or simulation in the Do section, it's time to review and analyse the result of each of the test that you have conducted.
This stage is very important because it allows you to evaluate your solution is workable and gave improvement to your process that you intend to improve and also decision making to continue use or revise your plans as necessary. Review the expectations that you have defined in Step 1, to assess whether your idea was a success.

During your review of your result, it is important to compare the results between before and after.
If the results obtained in the verification section are not satisfactory, it is recommended that you return to the Planning phase to relook and re-plan again.

This is the basically the Check section.