The Control Plan is a key document in controlling a process. It specifies the process variables and the required characteristics of the product, and how they are to be measured and controlled. The information in the control plan is used to generate detailed Work Instructions and other shop floor documentation:
Failure Mode and Effects Analysis (FMEA) is often used to identify the things that can go wrong, and how they can be prevented. The FMEA analysis is then used to generate the control plan.