Wednesday, January 5, 2011

Design Principles

What are Software Design Principles?

Software design principles represent a set of guidelines that helps us to avoid having a bad design. The design principles are associated to Robert Martin who gathered them in "Agile Software Development: Principles, Patterns, and Practices". According to Robert Martin there are 3 important characteristics of a bad design that should be avoided:

* Rigidity - It is hard to change because every change affects too many other parts of the system.
* Fragility - When you make a change, unexpected parts of the system break.
* Immobility - It is hard to reuse in another application because it cannot be disentangled from the current application.

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