In order to compare the behavior of teachers at different grade levels within Project PLAN, a program of individualized instruction, eight observers were trained in the use of a specially developed teacher observation system (PLAN-TOS) which includes 17 categories of behavior, and observations were made of all 66 Project PLAN teachers in the 14 San Francisco Bay Area participating schools. The research hypotheses, based on the fact that the individualized instruction program is more structured at the primary level, were that PLAN primary level teachers would spend significantly more time than PLAN upper level teachers in group discussion and that PLAN upper level teachers would spend significantly more time than PLAN primary level teachers in individual instruction. Results indicated no significant difference between the two groups in group discussion time. There was a significant difference in individualized instruction time, but it was in the opposite direction than predicted. The PLAN-TOS has been expanded to include more categories of group discussion for more precise anaylsis. (RT)