There is a certain dogma associated with useful techniques such as information hiding and object oriented programming that are sometimes taken too far. These techniques let one code abstractly and anticipate change. I personally think, however, that you should not produce much speculative code. For example, it is an accepted style to hide an integer variable on an object behind mutators and accessors, so that the variable itself is not exposed, only the little interface to it. This does allow the implementation of that variable to be changed without affecting the calling code, and is perhaps appropriate to a library writer who must publish a very stable API. But I don't think the benefit of this outweighs the cost of the wordiness of it when my team owns the calling code and hence can recode the caller as easily as the called. Four or five extra lines of code is a heavy price to pay for this speculative benefit.