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Dynamic Object Oriented Requirement System
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  DOORS can be used for requirement management and provides good tracability


The Structure
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  At the top most level we have projects

  Each Projects consists of different modules which are linked together


  There are three different types of modules
			1) Descriptive
			2) Formal
			3) Link

  1) Descriptive Module
	These are basically imported text files. This usually may be contractual documents like Customer requirement doc.
	These are not modifiable

  2) Formal Module
	These are hierarchically organized set of Objects (text)
	This can be viewed as a table with each row Corresponding to one unique Object with a unique Object Id
	(Object can be simply a collection of text)
	Objects(text) can be extracted ou t of a descriptive module and can be used in Formal Module
	The Formal module is editable and it can be linked to the proper Descriptive module thus providing good tracability

  3) Link Module
	This provides the links betwen different objects of same module or different module


Example
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   A contractual document like customer requirement doc can be imported into doors as a descriptive module.
   From this Descriptive module we can extract out objects to create the usecase document (which will be a formal module)
   Each usecase will be an Object and will have a unique identifier.

   Similarly a formal module can be created with test cases
   Here each testcase will be an Object and each of these testcases also will have unique id.
   We can link these test cases to the proper usecases thro' link modules