**IDEF0’s ancestor had data diagrams, too.** SADT has Activity diagrams, which are essentially exactly what [[IDEF0]] is, but also Data Modeling diagrams, which look similar but have slightly different semantics. The semantics of arrows for data: - Inputs are activities that produce the data. - Outputs consume the data. - Controls influence the internal state of the data. > [!tldr] They are basically just IDEF0 diagrams where the arrows are data. **** # More ## Source - [Structured analysis and design technique](https://en.wikipedia.org/wiki/Structured_analysis_and_design_technique) - [Toronto](http://www.cs.toronto.edu/~jm/2507S/Notes04/SADT.pdf) ## Related - [[IDEF0]] - [[IDEF0 and SADT]] - [[Diagram Types (index)]]