You are creating a model that shows how data moves through a system. Each function that modifies the data in any manner is identified, decomposed to smaller levels, and the system is completely described from start to storage.
What type of a modeling technique are you using in this scenario?
Functional decomposition is a modeling technique used to break down complex processes into smaller, more manageable parts. In this scenario, each function that modifies the data is identified and decomposed into smaller levels to completely describe how data moves through the system. This method focuses on the functions or processes and how they map to each other rather than just depicting how data flows.
The flow of data is usually depicted through data flow diagrams.
The model being created is to show the flow of data... The introduction of the decomposition is to serve as a distraction.
That is correct. However the question asks what technique is being used, not the process. The technique is breaking down the solution into smaller components for independent analysis. Thus, functional decomposition is correct.
data flow diagram is a technique as well per babokv3