How many layers is too many?

Posted by Nathan on Stack Overflow See other posts from Stack Overflow or by Nathan
Published on 2010-06-07T18:41:23Z Indexed on 2010/06/07 18:52 UTC
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As I have been learning about software development the last 2 years the more I learn, it seems the more gray areas I am running into. One gray area I have issues with right now is trying to decide how many layers an application should have. For example, in a WPF MVVM application what fashion of layering is ok? Is the following too separated? When I mention layering I mean creating a new class library for each layer.

  • Presentation (View)
  • View Model
  • Business Layer
  • Data Access
  • Model Layer
  • Utility Layer

Or for a non MVVM application is this too separated?

  • Presenation
  • Business
  • Data Access
  • Model Layer
  • Utility Layer

Is acceptable to run layers together and just create folders for each layer? Any coloring of this gray area would be appreciated.

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