The correct answer is A. Flowchart . In Six Sigma and process analysis, a PFMEA is built around understanding the process steps , potential failure modes at each step, their effects, and their causes. The supporting project-documentation material identifies both updated process maps and Failure Modes and Effects Analysis (FMEA) as part of project documentation. In addition, process analysis and documentation are explicitly carried out using process mapping and flow charting .

This means a flowchart is the most appropriate companion document for a PFMEA because it shows the actual sequence of process steps where failures may occur. It helps the team ensure that no major step is overlooked and that each failure mode is tied to the correct activity in the process. A stem-and-leaf plot is a data-display tool, not a process-documentation element for PFMEA. QFD is used for translating customer requirements into design characteristics, and Hoshin planning is a strategic planning tool. Neither serves as the direct process-step reference needed for PFMEA documentation. Therefore, the best verified answer is A. Flowchart .