SCJP for Java 6 Exam 310-065.
Coupling
Let's start by making an attempt at a definition of coupling. Coupling is the degree
to which one class knows about another class. If the only knowledge that class A
has about class B, is what class B has exposed through its interface, then class A and
class B are said to be loosely coupled...that's a good thing. If, on the other hand,
class A relies on parts of class B that are not part of class B's interface, then the
coupling between the classes is tighter...not a good thing. In other words, if A knows
more than it should about the way in which B was implemented, then A and B are
tightly coupled.
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Cohesion
While coupling has to do with how classes interact with each other, cohesion is all
about how a single class is designed. The term cohesion is used to indicate the degree
to which a class has a single, well-focused purpose. Keep in mind that cohesion is a
subjective concept. The more focused a class is, the higher its cohesiveness—a good
thing. The key benefit of high cohesion is that such classes are typically much easier
to maintain (and less frequently changed) than classes with low cohesion. Another
benefit of high cohesion is that classes with a well-focused purpose tend to be more
reusable than other classes.
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Про coherence там ничего не нашел.