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  Object Oriented Design Methods

Object Oriented Design Methods

The first attempts  to describe  an object oriented design method did not  surface until the  early 1980, both  Abbatt  and Booch contended that  OOD  begins  with a natural language( e.g. English ) description  of the solution  strategy for the software realization  of a real  world problem.  From this  description  the designer can isolate objects and operations.  Later contributions by schlaer and  Mellor and coad and yourdon  introduced a more comprehensive notation to  support  this approach and argued that this  activity is more properly characterized  as analysis. 

At their  stage of evolution OOD methods  combine  elements of all three design  categories discussed earlier in this book. Data design  architectural design and procedural  design. By identifying classes and objects data  abstractions are  created. By  coupling operations to  data modules are specified and a structure  for the software is established.

Early OOD approaches are typified by the following steps.

1. Define  the problem.

2. Develop  and informal strategy ( processing  narrative) for the software  realization of  the  real  world problem  domain.

3. Formalize  the strategy  using  the following sub steps:

  • Identify objects and their  attributes
  • Identify  operations that may  be applied to objects.
  •  Establish interfaces by  showing  the relationship between objects and operations.
  • Decide on  detailed issue that will provide an implementation  description  for objects.

4. Reapply steps  2, 3, and 4 recursively.

It should  be noted  that all  four step ( with  possible  exception  of step 3 are performed  during  software  requirement analysis. Extending these  activities into  design the following steps are  added .

5. Refine  the work  done  during  OOA, looking for  subclasses, message characteristics  and other elaboration of detail.

6. Represent the  data structure associated with  objects attributes.

7. Represent the procedural detail associated with  such operation.

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