Early on I stressed that each APQP is unique both between companies and within a company. The same is true of document changes. On the previous page I discussed some of the expected effects of a change to the process FMEA. Because of the differences in how companies structure their documentation it is only possible in a course document such as this to address the effect of changing one document on another. Another reason this is true is because every change to a process FMEA does not automatically require a change to, for example, the control plan. When the evaluation is made it may turn out that the ‘risk’ number (the RPN) may be low and thus may not require a control.
In speaking of differences in company documentation, there are companies which (for example) combine their control plan and their process flow diagram into one document. This said, there is no process flow diagram per se to change. Because of the possible permutations of how a document system is set up, it is next to impossible in a course to ‘predict’ how a company will react within their documentation to a change in any given document.
Another example is where a company uses the Ford Dynamic Control Plan (APQP and Control Plan manual, page 100) methodology where the control plan is combined with the process FMEA.
As we proceed through this presentation, keep in mind that where we discuss the changes in one document and its effects on another you will have to look at your company’s documentation structure and determine equivalencies.
The differences in documents within a company with respect to the the changes in one driving a change in another is only one aspect to consider as you go through this presentation. There is also the time line for documentation. If, for example, you are using Ford’s Dynamic Control Plan methodology, you have two documents in one. In this presentation if we discuss how a change to the process FMEA may affect the process control plan, we are talking about the same document. None the less, the underlying theory is still true. You just have to look at the situation from the perspective of the elements contained in the document. For example, a change to the FMEA part of the DCP (Dynamic Control Plan - APQP and Control Plan manual, page 100) may affect the process control plan element. A DCP is one document with 2 elements within it.