A computerized system is described which assists in collecting and processing interaction analysis data. This type of data can be a valuable source of feedback in such situations as a teachers' inservice training program. In this approach, observed behaviors are classified into one or more of 10 different categories, and a digit is assigned to describe each category. An observer uses a touch telephone data set to transmit the appropriate number code for each behavior directly to the computer. The computer analyzes this data and provides feedback to the observer in the following forms: a sequential tally of each code used, an interaction analysis frequency matrix, an interaction analysis relative-frequency matrix, a redefinition of categories, and a value for several variables derived from the frequency matrix. Examples of coding systems which have been used in "live" classroom situations are considered. Several possible applications of the data collection method to answer questions about classroom behavior are suggested. For example, a teacher might want to know whether or not he uses student ideas immediately after a student has commented or the extent to which he involves each student in discussion. Examples of a consultant's interaction with the system and cost estimates are included. (JY/MT)