If you are using an Ishikawa diagram to determine the root cause of problems, which process are you engaged in?

Plan Quality Management focuses on identifying quality requirements and standards for the project and product - root cause analysis of actual problems is not performed here.

Control Quality is the process of monitoring and recording results of quality activities to assess performance and recommend necessary changes. The Ishikawa diagram is explicitly listed as a tool and technique within Control Quality, used to trace observed defects or problems back to their root causes so corrective action can be taken on the actual source of the issue.

Risk Management processes deal with identifying and responding to uncertainties before they occur, not analyzing root causes of quality problems that have already manifested.

Plan Scope Management defines how scope will be defined, validated, and controlled - it does not involve quality defect analysis tools like the Ishikawa diagram.