Are you sure you are not actually using dataflow diagrams by another name?<p><a href="http:&#x2F;&#x2F;www.visual-paradigm.com&#x2F;tutorials&#x2F;data-flow-diagram-example-food-ordering-system.jsp" rel="nofollow">http:&#x2F;&#x2F;www.visual-paradigm.com&#x2F;tutorials&#x2F;data-flow-diagram-e...</a>