What is it?

A SIPOC (Suppliers Input Process Output Customers) diagram is used during the Define phase of the DMAIC process as a high-level process map to help focus a continuous improvement effort. Although the SIPOC analysis is straight forward and simple, failure to perform this analysis in the early stages of continuous improvement may introduce confusion or disagreement regarding the scope and elements of the project among team members.

Purpose

The purpose of the SIPOC diagram is to get team members to understand the process, get alignment on the areas affected, and to help brainstorming. This is used to clarify the scope of the project which can then be used to create more detailed process map.

How To Use

Step 1: Start with the Process column and write down the process from a high level. Include the critical steps of the process only. Try to limit to 4 or 5 steps.

Step 2: Determine all the outputs of the process being evaluated.

Step 3: List all the customers who receive the outputs from the process. These can be internal or external customers. If they are downstream processes, the outputs of this system are the inputs of the following system.

Step 4: Go back and think of the inputs needed for the established process.

Step 5: List all the suppliers of the inputs. Again, these can be internal or external suppliers. Think of upstream processes.

Related Notes: For more about Brainstorming techniques, click here.