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  External Documentation

Introduction to External Documentation

As the  internal documentation is concise and written at a level appropriate for a  programmer external documentation  is  intended to be  read also by those who  may never look at the actual code. For example  designers may review the external documentation  when  considering  modifications or enhancements. In addition  the external documentation  gives us a chance to explain things more broadly than might be reasonable   within our program  comments. If  we consider the header comment block to be an  overview or summary of our program, then the external documentation  is the full blown  report. It answers  the same  questions. Who  what  why when  where and how using  a system  rather than a component perspective. 

Because  a software  system is built from interrelated components the external  documentation  often  includes an  overview of the system  components or of several  groupings of components, like  user interface components, the database management  components etc. Diagrams  accompanied by  narrative describing  each component show  how  data are shared and used by one or more components in general the overview describes  how information is  passed from one component to another.

External components documentation  is part  of the overall system documentation. At  the time  the component  is written much  of the rationale for the  components structure and flow  have already been detailed in the design documents. In brief the design is the  skeleton of  the external  documentation and the flesh is supplied by narrative discussing the code components particulars.

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