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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Filed under:

c#

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wpf

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architecture

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mvvm

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n-tier

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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