Difference between function oriented design and object oriented design
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The functional design process involves identifying data transformations in the system, decomposing functions into a hierarchy of sub-functions, describing the operation and interface of each system entity and documenting the flow of control in the system.
Data-flow diagrams are a means of documenting end-to-end data flow through a system. They do not include control information. Structure charts are a way of representing the hierarchical organization of a system. Control may be documented using a program description language (PDL).
Data-flow diagrams can be implemented directly as a set of cooperating sequential processes. Each transform in the data-flow diagram is implemented as a separate process. Alternatively, they can be realized as a number of procedures in a sequential program.
Functional design and object-oriented design usually result in totally different system decompositions. However, the most appropriate design strategy is often a heterogeneous one where both functional and object-oriented approaches are used.
Data-flow diagrams are a means of documenting end-to-end data flow through a system. They do not include control information. Structure charts are a way of representing the hierarchical organization of a system. Control may be documented using a program description language (PDL).
Data-flow diagrams can be implemented directly as a set of cooperating sequential processes. Each transform in the data-flow diagram is implemented as a separate process. Alternatively, they can be realized as a number of procedures in a sequential program.
Functional design and object-oriented design usually result in totally different system decompositions. However, the most appropriate design strategy is often a heterogeneous one where both functional and object-oriented approaches are used.
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