This paper describes the various procedures associated with the individual interviews that are part of the data gathering processes of the Coordinated Study being carried out by the Mathematics Work Group of the Wisconsin Research and Development Center for Individualized Schooling. The first major section describes the six basic verbal addition and subtraction problem types used in the study, how they were selected and how they are varied by substitution of verbal and numerical terms. The second section briefly characterizes the general interview procedures and verbal protocols. The final section gives definitions of the various student behaviors that can be expected in response to the presentation of the verbal problems. The behaviors are classified by models, correctness, strategies, and errors. (Author)