A SIPOC diagram is a tool used in the Six Sigma methodology. SIPOC stands for Suppliers, Inputs, Process, Outputs, and Customers. During the Define phase of DMAIC, a SIPOC diagram is often used to identify relevant elements of a process improvement project. It helps to understand the process, identify the resources needed, and establish a clear starting and ending point for the process. It’s particularly useful in the planning stage of a project to define the scope12.