>Anyone know of a good book on class design?
>

Gamma, E., Helm, R., Johnson, R, and Vlissides, J. (1994), Design Patterns, Elements of Object Oriented Software, Addison Wesley, Reading, MA, ISBN 0-201-63361-2.

Riel, A (1996), Object Oriented Design Heuristics, Addison Wesley, Reading, MA, ISBN 0-201-63385-X.