Reflect on your classroom culture and environment; consider antecedents leading up to a students disruptions, can these two forces be aligned to improve the quality of time spent together? This site was developed for a project that has ended, but the concepts are sound and a good introduction to PBIS. http://www.pbisaz.org/basics-introduction

More where that came from:
http://www.pbis.org/ PBIS from the OSEP Resource Center
http://bit.ly/kaVkoe Top 10 PBIS Online Resources (Blog)
http://iris.peabody.vanderbilt.edu/resources.html Incredibly robust site with video, Spanish translation, case studies and more on a HUGE range of topics!