Two separate studies were conducted to ascertain the effect of computer-based resource guides on teachers' curriculum planning abilities and on their classroom behavior. In the first study 36 primary grade teachers from 20 schools, divided into experimental and control groups, were asked to complete data sheets describing their students' characteristics and the objectives they wished to achieve in a unit on "transportation." The control group received a resource guide which the computer had tailored to their particular students. Results indicated that teachers using a computer-based guide exhibited clearer ability to construct a teaching unit than teachers using a standard guide. The second study used the same procedure for distributing resource guides to 19 high school social studies teachers and 19 third grade teachers in 11 schools. Pre- and post-unit observations of teacher behavior showed that the experimental group exhibited significantly more behaviors related to individualizing instruction than the control group. It was also noted that within the experimental group, the high school teachers' behavior changed more than that of the elementary school teachers. (RT)