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Function model - Wikipedia
Functional Modelling in object oriented analysis and design
Functional modelling and Information Flow modelling
Getting started with functional modeling for system specifications
Functional Model - CIO Wiki
Functional Architecture - SEBoK
OOAD - Functional Modeling - Online Tutorials Library
Functional Modeling: Master Your Problem-Solving Skills - PRIZ …
Use Cases: Building the Functional Model - Florida State …
CHAPTER 4: BUSINESS PROCESS AND FUNCTIONAL MODELING