Classroom response systems (CRS), also called student/audience response systems or clickers, have been used by business instructors, particularly in larger classes, to allow instructors to ask students questions in class and have their responses immediately tabulated and reported electronically. While clickers have typically been used to measure attendance, gauge comprehension and test students, we propose that classroom response systems can also be used to effectively create an active learning environment. Specifically we detail the use of classroom response systems to utilize active learning in large classes (i.e., more than 70 students) through describing five sample CRS exercises in Marketing courses: Sequential Elimination, Why Do You Think That?, Experiential Exercises, What Would You Do?, and Forced Choice. These exercises though, could be adapted for use in other business classes.