title: How do you know when to use design patterns?
body: <p>Anyone can read the GoF book to learn what design patterns are and how to use them, but what is the process for figuring out when a design pattern solves a problem? Does the knowledge of the pattern drive the design, or is there a way to figure out how a pattern can be used to change a design?</p>
  
  <p>In other words, are there patterns for Patterns?</p>