Determining who and what with a functional flow diagram
This phase examines each of the interactions between the external actors, such as the author, and simply shows what happens between the external and internal actors during the logical flows labeled in the context diagram. This should be validated by the stakeholders before proceeding to a more detailed analysis of the interactions between all of the actors. In this example, the chapters for this book pass through the preliminary draft between the author and senior editor, and then the final draft stage through the project coordinator and technical reviewers. The latter phase is analyzed in the following diagram:
Figure 1.8 – A typical functional flow diagram
Each actor is a labeled ellipse, and the interactions are directional, labeled arrows. Multiple actions between the same actors, in the same direction, can be added to the label of a single arrow, rather than adding more arrows.
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