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Ques : What is Identifying Components and their Interaction

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 Ans : 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! Association
Functional modeling                                                                                 Data flow diagram
Design module development                                                                    High level function
Sub function development                                                                            Sub functions
Interaction modeling                                                                               Input and output data

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