Let students have an introduction about the topic they are going to work on. Give specific instructions and roles when they work in groups. Be specific and let them know what are you going to evaluate or score. Omit scoring creativity, decoration, writen works and other that may distract students from the main objective… that is to perform. Make sure to give different assigments to each student, so all students can present somenthing different. Make sure to ask the audience to listen to each classmate when presenting.