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Functional modelling and Information Flow modelling

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In the Functional Model, software converts information. and to accomplish this, it must perform at least three common tasks- input, processing and output. When functional models of an application are created, the software engineer emphasizes problem specific tasks. The functional model begins with a single reference level model (i.e., be manufactured). In a series of iterations, more and more functional detail is given, until all system functionality is fully represented. 

Information is converted because it flows from a computer-based system. The system takes input in various forms; Hardware, software, and human elements are applied to replace it; And produces in various forms. The transformation (s) or function may be composed of a single logical comparison, a complex numerical method, or a rule- the invention approach of an expert system. The output can light an LED or provide a 200 page report. Instead, we can create a model or flow model for any computer- based system, regardless of size and complexity. 

Structural analysis started as an Information Flow Modelling technique. A computer-based system can be modeled as an information transform function as shown in figure. 

A rectangle represents an external unit. That is, a system element, such as a hardware, a person or another system that provides information for transformation by the software or receives information provided by the software. A circle is used to represent a process or transform or a function that is applied to data and changes it in some way. An arrow is used to represent one or more data items. 

 

All arrows should be labeled in a DFD. The double line is used to represent data store. There may be implicit procedure or sequence in the diagram but explicit logical details are generally delayed until software design.
 


Last Updated : 06 Sep, 2021
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