Few clinical problems incite such disputation as the concept of minimal brain dysfunction (MBD). There are those who deny its existence and others who see the syndrome in the majority of troublesome children. The confusion stems from an interaction of the following factors: the differing viewpoints of the professionals who encounter its manifestations; the variability of its manifestations in different settings; the variability in the syndrome itself; and the variable meanings inferred from the diagnosis by professionals and parents when it is encountered. (49 pp.)