Module 01 Summary

What this module established

A chain runs every step, in order, exactly once, and that is a feature until you need branching, cycles or pausing. Those three are the only reasons to reach for a graph, and none of them is 'it uses a model'. The test is whether control flow depends on a value computed at run time.

Carry forward

• A graph charges you in transitions - each one a decision to justify and a path to test. Count them before adding branches.
• Four structures sit between a function and a graph. Work down the list and move up only when a named requirement forces it.
• A graph with one linear path is a function with machinery between you and the bug.

Before moving on

Move on when you can take a workflow you actually run, apply the run-time-dependency test to every step, and defend the structure you chose - including choosing 'a function'.

Mark complete