**Basic Rules for Produce GOOD IDEF0 Models** # Rules 1. Don't “improve” the method by adding things. It's [[simplicity]] is its strength. 2. Diagrams shall have contain 3 to 6 Functions 3. All functions contain:  Note: Always at least 1 control and 1 output. The IDEF Spec doesn't actually limit the number of lines on each side, I picked 3 for my article. Maybe 4 would be better. For all Diagrams other than the Context Diagram...  The Context Diagram has only one block. Also some explanatory text.  **** ## Source - The IDEF0 Spec - [My own article!](https://aarongilly.com/gillespedia/idef0/) ## Related - [[IDEF0]]