Business Analyst: What is a functional decomposition diagram?

Functional decomposition — breaking down complex functions into simpler parts.

Structure:

• High-level function at top.
• Sub-functions below.
• Each level more detailed.

Example - E-commerce:

Benefits:

• Manages complexity.
• Identifies components.
• Supports estimation.
• Facilitates design.

BA role: Decompose functions to understand scope.