Quantitative behaviour analysis requires the classification of behaviour to produce the basic data. This can be challenging when the theoretical taxonomy does not match observational limitations, or if a theoretical taxonomy is unavailable. Binary keys allow qualitative observation to be used to modify a theoretical taxonomy to produce a practical…

Utterances from stuttering and normally speaking children, aged two through four years, were analyzed by clinicians specializing in stuttering, general clinicians, and university students (total n=25). Results indicated that the validity of the data language used by researchers to describe stuttered and normal speech in early childhood may be…