PROBLEMThe study of verbal interview behavior results in the accumulation of (and the ultimate necessity to process) large quantities of data. This is true whether the investigative focus is on such global phenomena as personality traits or personality change, analysis of the content or themes expressed, or on such structural characteristics as frequency and durations of single units of speech and silence. Each research group studying the interview must develop its own solution to the problem of data recording and processing. For eight years our research group had used the electromechanical Chapple Interaction Chronograph (3 ) to record single units of speech and silence. However, during the past several years, we have experimented with and finally have developed a new electronic Interaction Recorder which records and permits the analysis of data with considerably improved efficiency.The most recent summary of our research program on the speech and silence behavior of interviewers and interviewees is presented elsewhere. ( 4 ) Before continuing this research program, with the new Interaction Recorder, it is necessary to insure comparability of the data collected by means of these two instruments.With both the Chapple Interaction Chronograph and the Interaction Recorder, a trained observer is needed in order to record the interview interaction. This observer, who can see and hear the interview from the other side of a one-way mirror, records each unit of speech by activating either the interviewer or interviewee "key". At the beginning of either participant's speech unit the appropriate key is depressed (or both, when both are talking simultaneously) , and at the completion of that speech unit the key is released. The observer's task is essentially identical when recording on either of the two devices.The printed record produced by the Chapple Interaction Chronograph can later be scored to produce mean scores on twelve different measures. However, only three (units, tempo, activity) of these measures are primary or first-order variables. The remaining nine measures are second-order or derivative. Measures of two major variables ("speech" and "silence"), which have been shown ( 2 ) to account for about 88 percent of the variance of the twelve measures, cannot be read directly from the Chapple Interaction Chronograph, although they can be derived fairly readily by a scorer. While it is possible, from the printed Interaction Chronograph record, to obtain sums of raw scores, the record does not permit calculation of the variance of any of these variables. To meet these needs, Chapple devised a scoring scheme which yielded a unit-by-unit record of interviewer and interviewee speech, silence, and interruptions through simple calculation from his complex measures. However, scoring a chronograph record in this way, while highly reliable, is a slow, timeconsuming, and tedious chore.To permit faster processing of data, we collaborated with the University of Oregon Medical School Research Instrument Service in automating the...