BA Technique #22: Functional Decomposition

Breaking down complex systems or processes into smaller, manageable components or functions

Erivan de Sena Ramos

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Photo by DCP on Unsplash

Hey, BAs in the house! We're back with another captivating Business Analysis technique from The BABOK Guide v3. Hold tight as we break down complex systems into manageable components with the technique of Functional Decomposition. It can help Business Analysts to dissect processes, analyze interactions, and gain a holistic understanding of system functionalities for practical analysis. Off we go!

What is this technique about?

Functional decomposition has its origin in mathematics. It simplifies complex things by breaking them into smaller parts and understanding how they fit together. It’s like solving a puzzle and seeing how each piece contributes to the whole picture. It’s a great way to tackle complexity and clearly understand how things work.

In Business Analysis, Functional Decomposition is a technique that involves breaking down a complex system or process into its constituent functions or sub-components. It enables Business Analysts to understand the various interdependencies and relationships between different system parts, providing a structured framework for analysis and decision-making.

How to apply this technique?

To effectively apply the Functional Decomposition technique in your Business Analysis, consider the following steps:

  1. Identify the System or Process: Clearly define the system or process you want to analyze and decompose. Understand its purpose, objectives, and the scope of your analysis.
  2. Identify High-Level Functions: Start by identifying the system's high-level functions or significant components. These functions represent the main building blocks of the system and provide an overview of its functionality.
  3. Decompose Functions: Break down each high-level function into sub-functions or lower-level components. Continue decomposing until you reach a granular level appropriate for your analysis.
  4. Define Relationships: Identify the relationships and dependencies between the decomposed functions. Determine how the parts…

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Erivan de Sena Ramos

Business Analysis & Requirements Engineering enthusiast. Information Systems & Software Engineering specialist. MBA in PM & HR. CBAP, PMP, CSM, ITIL & COBIT