This paper presents findings of a study that evaluated the effectiveness of an in-school suspension program (ISSP) at a suburban Atlanta high school. Data were derived from a questionnaire that explored staff's and students' perceptions of the effectiveness of the ISSP. Responses were received from 70 staff members and 190 students. Fifty percent of the students reported that they preferred out-of-school suspension to in-school suspension, and 60 percent preferred in-school suspension to detention. Seventy percent of the students perceived the ISSP as punitive and 70 percent of staff did not believe that participation in the ISSP improved students' attitudes. Findings indicate that the program was not as effective as it could have been and would be more effective if: (1) the administration and ISSP director played a stronger leadership role; (2) the entire faculty increased their support of the ISSP and were more involved in the program's operation; and (3) communication between the ISSP director and faculty improved regarding students' assignments, behavior, progress, and return to the classroom. Eight figures are included. Appendices contain copies of surveys. (Contains 24 references.) (LMI)