Constructive - serving to advance a good purpose; helpful
Criticism - The art, skill, or profession of making discriminating judgments and evaluations, especially of literary or other artistic works. The American Heritage Dictionary of the English Language
When we critique each others music (demos) do we really follow this?
But then again, what is Constructive Crittercism? I'll tell you...Any two or three Beavers building a dam. (couldn't resits!)