🚀 go-pugleaf

rmartin said:
   : The experienced designer does not proliferate classes on a whim.  He
   : does *exactly* what you have done.  He starts with a few classes, and
   : then partition them according to their convenient abstractions.  

In article <4i3vlj$jcs@netlab.cs.rpi.edu> ell@access4.digex.net (Ell) writes:
   Should the developer partition according to "convenient abstractions"  for
   "a few classes", gained at one phase of project iteration, and
   incrementation or according to the overall architecture of the project
   based on analysis vocabulary? 

Clearly one wants to begin with classes discovered from an analysis of
the problem domain.   

   : each partitioning, the designer ensures that the resultant code is
   : simpler and more resilient to change. 

   : You saw me do this in my book.  In almost every case I would start
   : with just a few simple core abstractions, and then I would hunt for
   : the underlying abstractions that would allow me to partition the
   : design to my advantage.

   How are underlying abstractions different from and more 
   important than domain vocabulary abstractions?

They are identical with domain abstractions.  However, they are
*abstractions*.  Often the problem domain vocabulary leads to classes
that are specific to the particular problem.  In many cases,
underlying abstractions can be found that encompass more than just the
particular problem being solved.  Very often these underlying
abstractions are found during subsequent iterations of the development
cycle.  


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