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Visual Models for Software Requirements by Joy Beatty and Anthony Chen

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Chapter 20. Data Flow Diagram

I love to cook and have many recipes. Each recipe has a set of ingredients and a set of steps that I need to follow. Most of the time, I have an idea of what I want to cook, so I pull out the recipe and go to the store to buy the ingredients. The recipe tells me which cooking equipment and techniques I will need to prepare the dish. Sometimes, though, I’m not exactly sure what I want to eat. Sometimes, I only know that I want something grilled or maybe I just want a recipe that will work with ingredients that I already have on hand. I wish I had a way to look at all the recipes that use the grilling process, a particular set of ingredients, or even a cooking technique.

The Data Flow Diagram (DFD) is an RML data model ...

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