What are the tangles?
Tangles are a bunch of intermingled circular dependencies. If any object in a tangle is changed, all of the other objects in that tangle are affected. The bigger the tangle is, the more significant its negative impact will be on the rest of the system. Tangles are first candidates for refactoring. By looking at the weakest links within them, you can break them down into smaller, acyclic parts.
