Logical data flow diagrams. Logical data flow diagrams illustrate how data flows in a system, with a focus on the business processes and workflows. With a focus on how the business operates at a high ...

The great Chicago planner Daniel Burnham spoke of the power of a “noble, logical diagram.” Once recorded, he said, it “will never die, but long after we are gone will be a living thing ...

Venn used the diagrams to prove a form of logical statement known as a categorical syllogism. This can be used to model reasoning. Here’s an example: “All computers need power.