Described is an NSF sponsored five week summer institute for 35 teachers and administrators interested in implementing AAAS Science - A Process Approach. Prior to the institute, interaction data were gathered while observing 18 of the 30 teachers teaching a science lesson of their own choice. The composite matrix indicated that someone was talking approximately 80 percent of the time; approximately 52.7 percent of the time it was teacher talk. The format of the institute included the activities of the AAAS Guide for Inservice Instruction. In addition, a series of 11 experimental stations were set up the final week and the participants worked on these experiments which required a synthesis of process skills. Pre- and post-measure scores on the Science Process Measure for Teachers indicated that prior to instruction the participants had a mean score of 11.40 out of a possible 25. After instruction, the group mean was 20.86. The results of the pre-institute interaction observations were used along with audio-training tapes to acquaint the teachers with the Flanders System. Post-institute interaction data (collected on 9 teachers) indicated that the category of silence or confusion increased from 17.93 percent to 29.80 percent. Teacher talk was reduced very slightly and student talk was reduced from 29.37 to 19.54 percent. (BR)