This controlled trial of a teacher training intervention aimed to increase teacher competence in managing the problem behaviours associated with Asperger's syndrome, as manifested in a classroom setting. All teacher-participants currently managed a student with Asperger's syndrome in an inclusive classroom setting. Measures were taken on two occasions: pre-workshop and 6-week follow-up. Variables of interest were number of problem behaviours, success of teacher strategies used to manage problem behaviours and teacher self-efficacy in managing behaviours. Qualitative data assessing both the utility of the workshop and effectiveness of the individual management strategies was also gathered. At 6-week follow up, teachers reported increased confidence in their ability to manage the student with Asperger's syndrome, fewer problem behaviours displayed by the student and increased success in using strategies to manage the student in the classroom. The utility of both the workshop itself and individual management strategies were also endorsed by all teacher-participants. Suggestions for future research and limitation of the study are also discussed.