This study examined the effectiveness of the LEAST Approach to Discipline with junior high school teachers having behaviorally disordered pupils in their classes. The sample consisted of twenty junior high school teachers who were paired on the basis of quantity and problem severity of behaviorally disordered pupils in their classes. Each matched pair was split and randomly assigned to the experimental and control group. Treatment consisted of eight hours of training in the LEAST approach. Subsequently, each experimental teacher was observed in class and given feedback regarding his application of the LEAST approach. The control group received no treatment. Following treatment, a two-month data collection period ensued. During this time data was collected for both groups on seven dependent variables. Specifically these were (1) teacher deviancy management skills, (2) pupil perception of the classroom environment, (3) pupil compliance, (4) office referrals, (5) teacher-parent conferences, (6) pupil absences and (7) non completed assignments.