It is argued that in order to make computer assisted instruction effective in the schools, educators should pay more attention to implementation issues (including modifying teacher attitudes, changing classroom routines, and offering realistic technical training and support) and to producing understandable product and performance evaluations. Issues identified for further evaluation are covariates such as teachers' and students' prior computer experience; the ergonomic design of computerized classrooms; design issues resulting from the pictorial representation of information; and the impact of educational technology integration on classroom social environments. (25 references) (GL)