The purpose was to establish the stability of behavior of secondary string teachers. The research problems were (a) to establish the frequency of selected observable elements of content and instructional strategies; (b) to estimate the stability of observed teaching behaviors within and across rehearsals; and (c) to determine the stability of pacing within and across rehearsals. In conclusion, for the population observed, stability of behavior existed. The variable of multiple conduction, not given much attention in research or pedagogical literature, weighted heavily in frequency of occurrence. Demonstration and verbal imagery, encouraged by strong experts, received less than 3% of rehearsal time. Pacing should be considered an important variable in the instructional process and merits further definition and research.