During the process flow diagram building phase, create the diagram of the main blocks of your process. Process/design FMEA should begin with a block diagram representing the system, subsystem, and/or components being analyzed for design FMEA, and the sequence of the process stages for the process FMEA. The diagram should indicate the functional relationships to the appropriate level of analysis.

For each item of the diagram, define all required parameters, such as name and item function.

The next section describes the basics of creating and manipulating the diagrams used to present a process for Process FMEA and a product for Design FMEA.