What is Functional Modelling
We know that Data flow modelling is an ordinary technique used for analysis of a problem in software engineering. It is very useful for analyzing and describing systems where there is a large amount of calculation involved.
Data flow models comprises of a number of methods which interchange information. A process transforms information it receives and passes transformed information on to other objects or to processes in system. Data flow models can be used to uncover new attributes and new operations for object model. Occasionally, new objects can be discovered too.