The Check process incorporates the process controls needed to be assured the “Do process” was performed correctly. Process control identifies the appropriate types of quality controls needed within a process, and designs and incorporates them as Check procedures into the process. Check procedures describe how to evaluate whether the right work was done (output meets needs) and whether the work was done right (output meets standards). Controls should be designed based on the criticality of the process and what needs to be checked.

Check procedures are defined in the same way as Do procedures. If the playscript format is used, Check procedures should be incorporated to the taskflow diagram or flowchart at the appropriate spot. For example, a quality control checklist associated with programming would have questions such as, "Was a flowchart produced that describes the processing of the program?" or “How much quality control is enough?”

The challenge is to install the appropriate amount and types of controls to minimize cost, effort, and cycle time; and to minimize the risk that defects will go undetected and "leak" into other processes.