Drawing the Blueprint: Flowchart, Functional Diagram, and Sequence Diagram

A software-modeling lesson for a Twitter clone focuses on the “Post a message” use case.

Using the existing Twitter database schema, the author derives three linked diagrams: a flowchart, a functional diagram, and a sequence diagram.

The diagrams map behavior, system components, and runtime interactions for message posting.

The example shows how a defined use case and data model can produce traceable, consistent design artifacts.