SIPOC Diagram Maker with Free Template

What is a SIPOC diagram?

A SIPOC diagram is a one-page, high-level map of a process in five columns: Suppliers (who provides the inputs), Inputs (materials, information, and systems the process needs), Process (4 to 7 high-level steps), Outputs (what the process produces), and Customers (who receives the outputs). It shows the whole process and everyone it touches on a single page, without the decisions and loops of a detailed flowchart.

Teams use a SIPOC to agree on scope before improving a process. It is a standard tool in the Define phase of Six Sigma DMAIC, where it fixes the start and end of the process, names the customers whose requirements will be measured, and gives everyone the same picture before detailed mapping starts. It is also a fast way to onboard a new team member or explain a process to a manager.

When to use a SIPOC

• Kicking off a Six Sigma or lean project. Build it with the team in the first meeting to agree what is in and out of scope.
• Writing a project charter. The SIPOC goes next to the problem statement so sponsors see exactly which process is being changed.
• Supplier or handoff problems. Listing suppliers and inputs side by side often shows an input nobody owns.
• Quality system documentation. ISO 9001 asks you to determine the inputs and outputs of each process; a SIPOC per process is a compact way to record them.
• Onboarding and audits. A one-page overview is easier to read than a 30-box flowchart.

How to fill in a SIPOC (recommended order)

You read a SIPOC left to right, but it is easier to fill in from the middle out: process first, then the right side, then the left. This is the order the editor above is designed around.

1. 1

   Name the process and set its boundaries

   Write one start trigger and one end point, for example "Start: supplier lot arrives. End: lot released or returned." Everything outside these two points is out of scope.

2. 2

   P: list 4 to 7 high-level steps

   Use verb-noun phrases ("Verify insurance", "Pack and label"). If you have 15 steps, group them. Decisions and loops belong in a later flowchart, not here.

3. 3

   O: list what the process produces

   Products, documents, data, and decisions. Include the outputs nobody celebrates, such as a nonconformance report or a rejected lot.

4. 4

   C: name who receives each output

   Internal teams count. Billing, the next shift, and the warehouse are customers just as much as the patient or shopper.

5. 5

   I: list what the steps need

   Materials, information, systems, and standards (a sampling plan or SLA is an input). Every step should be traceable to at least one input.

6. 6

   S: name who provides each input

   Vendors, other departments, systems, or the customer. When the same party is both a supplier and a customer, list it in both columns.

7. 7

   Check it with the people who do the work

   Walk the diagram with a few people from each step. Missing inputs and surprise customers usually show up in the first five minutes.

SIPOC vs flowchart vs swimlane vs value stream map

A SIPOC is the zoomed-out view. Once the scope is agreed, teams usually move to one of the more detailed maps below.

To go one level deeper, turn your SIPOC steps into a workflow diagram or an AI flowchart, or split them by department with the swimlane diagram generator. If you are mapping a chemical or plant process with equipment and material streams, you want a process flow diagram (PFD) instead. Our workflow diagram guide covers the symbols and steps.

Common SIPOC mistakes

• Too many process steps. A SIPOC with 12 steps has turned into a flowchart and loses its one-page overview. Keep 4 to 7 and move detail elsewhere.
• Describing decisions and exceptions. "If insurance fails, call payer" is flowchart detail. In a SIPOC, just write "Verify insurance eligibility".
• Confusing suppliers with inputs (or customers with outputs). The supplier is who, the input is what: "Payment gateway" supplies "payment authorization".
• Leaving out internal customers and suppliers. Finance, IT, and the next department in line are often the customers most affected by defects.
• No start and end point. Without boundaries the team argues about scope for the rest of the project.
• Filling it in alone. A SIPOC built at a desk reflects the procedure manual, not the real process.

Free blank SIPOC template

Prefer to fill it in by hand in a workshop? Download the blank template below and print it on a landscape page or project it on a whiteboard. It has the five labeled columns, writing lines, and six numbered process steps. To get a typed version, click Start blank in the editor above.

What comes after the SIPOC in DMAIC

With the scope fixed, the Measure and Analyze phases need a few more charts. Rank defect types with a Pareto chart, brainstorm causes of the top defect on a fishbone diagram, and track the improved process in the Control phase with a control chart.