CRS - Classroom Response System (CRS) offer you a dynamic way to facilitate interactive learning with your students. A CRS allows you to perform "on-the-spot" assessments, deliver quick quizzes, gauge your students’ understanding of a particular question or concept, and take your class roster easily. Use Houghton Mifflin’s text-specific slides to pose multiple-choice questions to your students and challenge them to answer using their wireless "clickers."