Identifying components and their Interaction in Software Engineering

Identification Process

1. Functionality modeling: Component identification always starts by decomposing
   the business domain problem structure into a well-defined visual model. Data flow
   diagram is one of the most popular visual models to depict function oriented
   design. .
2. Design module development: The next step is to convert individual elements in
   the DFD into a design module. During this process, the design modules need to be
   designed to ensure high cohesion and loose inter-module coupling. The modules
   that perform similar kind of functionalities and processes qualify for the main
   . design module. Design modules would then become key function component.
3. Sub function development: The main functions need to be broken down into sub
   functions. Utilities such as, data validation, data conversion, information Jogging
   would be good candidates for sub-functions.
4. Interaction modeling: The input and output elements from DFD can be used to
   design the interactions between functions.
   
   Component and Stage Mapping
   The following table indicates the component/association identified at each level of the
   process:
   

Stage	Component/Associativity
Functional modeling	Data flow diagram
Design module development	High level function
Sub function development	Sub functions
Interaction modeling	Input and output data