The computer-assisted teacher training system (CATTS) has been developed to provide a versatile technical system for the real-time collection, feedback, and analysis of observation-coding system data applied to the investigation of interactive behaviors and environments found in teacher behavior research in reading. CATTS technical innovations permit direct entry of observation data during the teaching process, instantaneous visual feedback into the teaching environment, delayed printed feedback summaries; and an indexed data storage and retrieval system. The application of CATTS real-time data processing capabilities to teacher behavior research provides an additional tool in the investigation of the reading process. (Author)