Free IDEF0 Diagram Maker — Map Processes

See it work

IDEF0 diagram examples.

Same tool, four requests. Every drawing below is a real render.

What you type

Create an IDEF0 template for processing a customer return: receive the request under the return policy with the customer service team, inspect the returned item using an inspection checklist and warehouse associate, approve a refund or exchange under refund rules with the payment system, then restock or dispose it under inventory standards with the inventory system; show the customer result and updated inventory record as outputs.

Then tryAdd fraud review as a control.Change the final function to refurbish returned item.

IDEF0 function model: Customer return process

IDEF0 function model · FIPS PUB 183 (1993) · schematex-idef0

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The drawing

What an IDEF0 diagram is.

IDEF0 is a function-modeling method. Each activity box has Inputs on the left, Controls above it, Outputs on the right and Mechanisms below it; together these are called ICOM.

A context diagram can show one top-level function, while a decomposition diagram breaks that function into smaller activities. It is useful when the question is what a function needs and produces, not simply what happens next.

Standard: FIPS PUB 183 (1993)
Also follows: SADT (Ross)
Engine: schematex-idef0
Editable: Double-click text, drag nodes
Export: SVG · PNG · PDF

IDEF0 function model: What an IDEF0 diagram is

Who uses it

Who uses IDEF0 diagrams.

Process analysts

A shared model of the inputs, controls, outputs and resources involved in an operational process.

Systems and manufacturing teams

Context diagrams and functional decompositions for production work governed by specifications and quality standards.

Software delivery teams

Integration and testing activities with their plans, standards, tools and resulting defect information.

How it works

How to make an IDEF0 diagram in three steps.

Describe it

One paragraph is enough to start.

“Create an IDEF0 template for processing a customer return: receive the request under the return policy with the customer service team, inspect the returned item using an inspection checklist and warehouse associate, approve a refund or exchange under refund rules with the payment system, then restock or dispose it under inventory standards with the inventory system; show the customer result and updated inventory record as outputs.”

See the drawing

Drawn by the right engine.

Say what changes

Every edit keeps a version.

Add fraud review as a control.

V2 · DRAWN FROM V1, NOTHING RETYPED

FAQ

Common questions

What is an IDEF0 diagram?

IDEF0 is a structured way to model functions in a system. Its ICOM layout shows each function’s inputs, controls, outputs and mechanisms.

How is IDEF0 different from a flowchart?

A flowchart emphasizes sequence and decisions. IDEF0 emphasizes what a function needs, what governs it, what it produces and what resources perform it.

What are inputs, controls, outputs and mechanisms?

Inputs are transformed by the function. Controls constrain or guide it. Outputs are its results. Mechanisms are the people, systems or equipment that carry it out.

Can an IDEF0 model be decomposed?

Yes. Begin with a high-level function, then create child functions that explain how that work is performed in more detail.

When should I use a context diagram?

Use one when you need to define the scope of a process before modeling its internal activities.

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