Functional & Behavioral Perspectives

What you will learn

• Study Functional Perspective: Data Flow Diagrams.
• Study Modeling Elements (DeMarco Notation).
• Study DFDs: What They Cannot Show.
• Study Functional Perspective: UML Activity Diagrams.

Lesson summary

This lesson introduces Functional & Behavioral Perspectives within the Model-Based Documentation module. It provides a structured overview of models and their properties, goal models (AND/OR trees), use cases and UML use case diagrams, data perspective (ER and class diagrams), and functional/behavioral perspectives (DFD, activity diagrams, statecharts, state machines). The main areas are Functional Perspective: Data Flow Diagrams, Modeling Elements (DeMarco Notation), DFDs: What They Cannot Show, Functional Perspective: UML Activity Diagrams, Modeling Elements. The learning objectives are to study Functional Perspective: Data Flow Diagrams; study Modeling Elements (DeMarco Notation); study DFDs: What They Cannot Show. You will see how the terminology fits into practical requirements-engineering work, which distinctions matter for the Foundation Level syllabus, and where candidates commonly confuse closely related ideas. The complete lesson adds worked examples, comparisons, interactive revision activities, and short checks that help you apply the concepts instead of memorising isolated definitions. Use this preview to understand the scope and decide where the lesson belongs in your study plan; enrolment unlocks the full written explanation and exercises.