SIPOC Diagram Template

The five-box view of how work actually flows

A SIPOC diagram maps a process in five parts: **S**uppliers, **I**nputs, **P**rocess, **O**utputs, **C**ustomers. It does not try to document every decision point or exception. Instead it gives you a single, readable snapshot that answers a simple question: what goes in, what happens to it, what comes out, and who receives it. That simplicity is the point. Process problems rarely sit inside a single step. They show up at the boundaries — where an input arrives that the process cannot use, or where an output reaches someone who expected something different. SIPOC makes those boundaries visible. You can use the diagram to orient a new team member, to frame a process improvement discussion, or to confirm that everyone in the room understands the same process. The checklist guides you through each of the five boxes in sequence, so you can complete the picture without losing the thread.

Why map the process before you try to improve it

Improvement efforts that begin with solutions tend to drift. Someone has a fix in mind, the team argues about it, and the underlying process stays out of focus. A SIPOC diagram resists that by forcing the conversation back to what the process needs, what it does, and who it serves — before anyone proposes a change. It also exposes dependencies. When you name the entities that initiate work by submitting requests and work orders for execution, you make visible where the process relies on outside parties. When you name the recipient of the output from the process, you make visible whose expectations have to be met. The diagram is not a deliverable in itself. It is a shared reference. Once everyone can point to the same five boxes and agree on what is in them, the disagreements that matter — about what should change and why — become easier to resolve.

What a good SIPOC diagram covers

A complete diagram names specifics at every stage. Vague entries defeat the purpose. - **Suppliers** — the entities that initiate work by submitting requests and work orders for execution. Name the roles, teams or organisations, not just 'stakeholders'. - **Inputs** — the requests or work orders provided by suppliers for processing. These are what the process consumes; they are not the same as the process itself. - **Process** — the actions taken to transform the input into a specified output. This is the only column where sequence matters. List the core steps in order. - **Outputs** — the products or services resulting from the process. Describe them as the customer would recognise them. - **Customers** — the recipient of the output from the process. Could be internal, external, or both. A useful test is whether a reader unfamiliar with the process could trace the flow from a named supplier, through a named input, through a described step, to a named output, to a named customer. If any link is missing or generic, the diagram has a hole that will show up again later.

How to carry out a SIPOC session

The diagram is short, so the work is mostly about getting the right people together and keeping the conversation at the right level. Start by recording the session details — the date conducted, the person who prepared the diagram, and the location. This matters if the diagram will later be referenced or revisited. Work through the boxes in order. Suppliers first: ask who initiates work by submitting requests and work orders for execution. Then Inputs: what those suppliers provide for processing. Then Process: the actions taken to transform the input into a specified output. Then Outputs: the products or services resulting from the process. Then Customers: the recipient of the output. Resist the urge to zoom in. If someone starts describing a sub-step, note it and move on; the diagram is meant to be read at a glance. Once the five boxes are filled, walk the flow end to end and check that each stage connects to the next. Close by signing off, recording the time, and noting the real start and end dates of the session.

Frequently Asked Questions

A SIPOC diagram is a one-page snapshot of a process that names five things: the **suppliers** who provide what the process needs, the **inputs** they provide, the **process** steps that transform those inputs into something of value, the **outputs** the process produces, and the **customers** who receive them. Rather than documenting every decision point, SIPOC stays at a high level so you can see the whole flow at a glance. The checklist walks through those five elements in order: Suppliers, Inputs, Process, Outputs and Customers. Each step asks you to name what belongs at that stage, so the resulting picture shows how the pieces connect before you go deeper.

Process work goes wrong most often at the handoffs: an input arrives in a form the process step cannot use, or an output reaches a customer who never asked for it in that shape. A SIPOC diagram forces those handoffs onto one page. By naming suppliers and the requests or work orders they provide, then naming the actions taken to transform that input into a specified output, then naming the recipient of the output, you can see where responsibility transfers. When something fails, you know whether to look at the supplier, the input, the process step, or the customer's expectation.

Document the process at a level that covers the full flow without drowning in detail. A workable SIPOC includes Suppliers (the entities that initiate work by submitting requests and work orders for execution), Inputs (the requests or work orders provided by suppliers for processing), Process (the actions taken to transform the input into a specified output), Outputs (the products or services resulting from the process), and Customers (the recipient of the output). For each stage, name the specific parties and artifacts rather than writing 'various' or 'as needed'. The process column should list sequential actions that transform the input into the specified output — not every sub-step, but the core sequence a newcomer could follow. The value of the diagram comes from what it excludes as much as what it includes.

Run it end to end with the people who do the work. Start with the Inspection section: record the date conducted, who prepared it, and the location. Work through Suppliers first, listing the entities that initiate work by submitting requests and work orders for execution. Then move to Inputs and list the requests or work orders provided by those suppliers for processing. For Process, describe the actions taken to transform the input into a specified output. For Outputs, list the products or services resulting from the process. For Customers, name the recipient of the output. Close with a signature and the finished-at time, and record the inspection's real start and end dates so the session is traceable. Because the diagram is deliberately short, the work is more about getting the right people in the room than filling in fields.

The diagram itself will show you where the gaps are. A supplier who sends requests or work orders that the process cannot accept, an input that arrives without the information needed for the transformation, a process step that no one can describe clearly, an output that does not match what the customer expected — each of these appears as a mismatch between two adjacent boxes. Improvements then tend to fall into one of two categories: fix the handoff (change what the supplier provides, or how the customer's needs are specified), or fix the transformation (change the actions taken to convert input into output). Because the diagram names specific suppliers, inputs, outputs and customers, the fix can be assigned to a named party rather than left as a general concern.

Written by

Arne Reis

Founder

Process optimizer with 25 years of expertise, focused on operational excellence in quality, maintenance, EHS, and commissioning. Emphasizes innovative solutions and top-quality standards.

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