Classroom Response Systems ("Clickers")

by Derek Bruff, Assistant Director, Vanderbilt Center for Teaching

See also Derek's article titled "Clickers: A Classroom Innovation" in the October 2007 issue of The Advocate, the newsletter of the higher education division of the National Educational Association.

What Is a CRS?

A classroom response system (sometimes called a personal response system, student response system, or audience response system) is a set of hardware and software that facilitates teaching activities such as the following.

  • A teacher poses a multiple-choice question to his or her students via an overhead or computer projector, perhaps using PowerPoint to do so.

  • Each student submits his or her answer to the question using a handheld transmitter (often called a “clicker”) that beams an infrared or radio-frequency signal to a receiver attached to the teacher’s computer.

  • Software on the teacher’s computer collects the students’ answers and produces a histogram showing how many students chose each of the answer choices.

Videos

  • Clickers in Action - In this short video, Dee Silverthron of the University of Texas explains how she uses clickers in her vertebrate physiology course.

  • Clicker Technology - This short video from the PressWestern Project at the University of Western Ontario provides a little more information about clicker technology.

Terminology

The Vanderbilt Center for Teaching has decided to use the term "classroom response system" to describe this technology. The term "audience response system" is another popular term, but some faculty see that term as implying that students are passive members of an audience, which runs counter to their use of this technology in getting students actively engaged with course material during class. The term "personal response system" is also popular, but we have decided not to use it, since it happens to be the brand name of a particular vendor's system. "Student response system" is also a useful term, but it doesn't highlight the use of these systems in the classroom and could refer to an online response system of some kind.

"Professor Ross Cheit put it to the students in his Ethics and Public Policy class at Brown University: Are you morally obliged to report cheating if you know about it? The room began to hum, but no one so much as raised a hand.

"Still, within 90 seconds, Cheit had roughly 150 student responses displayed on an overhead screen, plotted as a multicolored bar graph -- 64 percent said yes, 35 percent, no."

-- "No Wrong Answer: Click It," Associated Press, May 14, 2005.

Teaching with a CRS

Types of Questions

In addition to facilitating a variety of teaching activities, CRSs enable a teacher to ask a variety of types of questions. Notes that each of the following question types can be appropriate to the multiple-choice question format.

  • Factual Questions: These questions might be used to see if students did the reading, remember important points from prior classes, or have memorized key facts.

  • Conceptual Questions: While difficult, it is possible to write multiple-choice questions that demonstrate whether or not students understand important concepts and principles.

  • One-Best-Answer Questions: These questions include multiple answer choices, more than one of which could be argued as correct. Students are asked to select the one best answer from these choices. These are also referred to as "partially correct multiple-choice questions" (Burnstein & Lederman, 2006).

  • Opinion Questions: Evaluative and opinion questions may not have correct answers, but asking these questions can engage students and provoke rich discussions, particularly in response to ethical, legal, or moral issues.

  • Data Gathering Questions: A CRS can be used to quickly gather demographic, opinion, or other data from a class full of students. This is often useful in social science classes that utilize social or economic experiments in the classroom.

  • Questions Asking for Predictions: In science classes, students can be asked to predict the outcome of an experiment prior to being shown the experiment. This gives the teacher a sense of the students’ preconceptions and increases the surprise value of the experiment when students see just how many of their classmates expected different outcomes.

  • Games: In social science classes, particularly economics, classroom games are played to illustrate points about human behavior. A CRS can facilitate data-gathering in such games.

  • Feedback on Teaching: CRSs can also be used to ask students to provide direct feedback on how well a particular class is going. For example, one might ask students to rate their level of understanding of the lecture thus far on a scale of 1 to 4.

Types of Activities

Teaching with a CRS can take a number of directions. Teachers will want to match activities to course content, time constraints, learning objectives, and their own teaching styles. Some possibilities for CRS activities include the following, listed more or less in order of increasing levels of student engagement.

  • Attendance: Clickers can be used to take attendance directly (e.g. asking students to respond to the question "Are you here today?") or indirectly by determining which students used their clickers during class.

  • Summative Assessment: Clickers can be used for graded activities, such as multiple-choice quizzes or even tests. Some brands of clickers allow for a "student-paced" mode in which students answer questions on a printed test at their own pace.

  • Formative Assessment: Clickers can be used to pose questions to students and collect their answers for the purpose of providing real-time information about student learning to both the instructor and the students. Students can use this feedback to monitor their own learning, and instructors can use it to change how they manage class "on the fly" in response to student learning needs. Some brands of clickers allow students to register their confidence level (high, medium, or low) along with their answer, providing more detailed feedback to the instructor.

    Some instructors assign participation grades to these kinds of formative assessments to encourage students to participate. Other instructors assign points for correct answers to encourage students to take these questions more seriously. Other instructors do a mix of both, assigning partial credit for wrong answers.

  • Homework Collection: Some brands of clickers allow students to record their answers to multiple-choice or free response homework questions outside of class and submit their answers via the clickers at the start of class.

  • Discussion Warm-Up: Posing a question, giving students time to think about it and record their answers via clickers, and then displaying the results can be an effective way to warm a class up for a class-wide discussion. Compared with the approach of taking the first hand that is raised after a question is asked, this approach gives all students time to think about and commit to an answer, setting the stage for greater discussion participation.

  • Contingent Teaching: Since it can occasionally be challenging to determine what students understand and what they do not understand, clickers can be used to gauge that in real-time during class and modify one's lesson plan accordingly. If the clicker data show that students understand a given topic, then the instructor can move on to the next one. If not, then more time can be spent on the topic, perhaps involving more lecture, class discussion, or another clicker question.

    This approach has been called "agile teaching" by Beatty et al. (2006), who write, "This contrasts with the common practice of teaching according to a 'ballistic' lesson plan: designing a plan for an entire class meeting, 'launching' the plan, hoping that it hits reasonably close to its target, and waiting for the next exam to know for certain." Certainly there are other ways to determine if students are understanding course material as one progresses through a course, but clickers can provide a convenient way of doing so. See also Draper & Brown (2004) for more on this approach.

  • Peer Instruction: The teacher poses a question to his or her students. The students ponder the question silently and transmit their individual answers using the clickers. The teacher checks the histogram of student responses. If significant numbers of students choose the wrong answer, the teacher instructs the students to discuss the question with their neighbor. After a few minutes of discussion, the students submit their answers again. This technique often (but not always!) results in more students choosing the correct answer as a result of the peer instruction phase of the activity. This is a fairly simple way to use clickers to engage a large number of students in discussions about course material. This approach can also set the stage for a class-wide discussion that more fully engages all students. See Mazur (1997) for more on this approach.

  • Repeated Questions: In the peer instruction approach described above, students respond to a given question twice--once after thinking about their answer individually and again after discussing it with their neighbor. Some instructors ask the same question several times, with different activities in between rounds of voting designed to help students better answer the question. For instance, an instructor might have the students answer the question individually, then discuss it with their neighbor and respond, then participate in a class-wide discussion and respond, and then listen to a mini-lecture on the topic and respond. For particularly challenging questions, this can be an effective technique for helping students discover and explore course material.

  • Question-Driven Instruction: This approach combines contingent teaching and peer instruction. Lesson plans consist entirely of clicker questions. Which questions are asked depends entirely on how students answer the questions. An instructor might come into class with a stack of clicker questions, with multiple questions on each topic. As students perform well on clicker questions, the instructor moves on to questions on new topics. As students perform poorly, the instructor asks further questions on the same topic. The instructor does not have a lesson plan in the traditional sense when using this approach. Instead, the course of the class is determined reactively to demonstrated student learning needs. See Beatty et al. (2006) for more on this approach.

  • "Choose Your Own Adventure" Classes: In this technique, an instructor poses a problem along with several possible approaches to solving it--perhaps approaches suggested by students during class. The instructor has the students vote on which approach to pursue first, then explores that approach with the students. Afterwards, the students vote on which approach to pursue next. See Hinde and Hunt (2006) for an example of this approach.

Examples

  • Economics

    In this podcast interview, Stephen Buckles, senior lecturer in economics here at Vanderbilt University, describes his use of a classroom response system in his large undergraduate courses.

  • Mathematics

    Project Math QUEST is a project funded by the National Science Foundation to write and test clicker questions for use in linear algebra and differential equations courses. Their questions are available online, and their resource page contains links to other question banks in the field of mathematics.

  • General Physics (PowerPoint)

    Shane Hutson, Assistant Professor of Physics and Astronomy at Vanderbilt, describes his use of the H-ITT classroom response system in a general physics course in this PowerPoint file. He used a CRS for ConcepTests (checks of student understanding during lectures), interactive demos (having students guess the results of a physics demonstration immediately before the demo), and reading quizzes (graded assignments designed to see if students did their readings before class).

  • Architectural Engineering

    The Interactive Technology to Improve the Classroom Experience (INTICE) project at the College of Engineering at the University of Texas at Austin evaluated the use of a CRS in one of their architectural engineering core classes. Their report, available at the above link, provides example questions and details their evaluation of the CRS as a learning tool.

  • Vertebrate Physiology

    Dee Silverthorn of the School of Biological Sciences at the University of Texas at Austin uses a CRS in her upper level vertebrate physiology class. The link above leads to a series of well-produced QuickTime videos in which Professor Silverthorn describes her experiences with a CRS. The videos also show a CRS in action.

Why Use a CRS?

A teacher can use a CRS to...

  • ...Maintain students’ attention during a lecture. Studies show that most people’s attention lapses after 10 to 18 minutes of passive listening. Inserting a few CRS-facilitated activities every so often during a lecture can help maintain students’ attention. See The "Change-up" in Lectures for more on this idea.

  • ...Promote active student engagement during a lecture. Posing well-chosen questions to students during lecture and expecting answers from each student can cause students to reflect on and assimilate course content during class.

  • ...Promote discussion and collaboration among students during class with group exercises that require students to discuss and come to a consensus.

  • ...Encourage participation from each and every student in a class. Asking a question verbally and calling on the first student to raise his or her hand results in one student participating. A CRS-facilitated activity can involve not one, but all of the students in the class.

  • ...Create a safe space for shy and unsure students to participate in class. A CRS gives students a chance to respond to a teacher’s question silently and privately, enabling student who might not typically speak up in class to express their thoughts and opinions. A CRS also enables students to respond anonymously to sensitive ethical, legal, and moral questions.

  • ...Check for student understanding during class. By asking CRS-facilitated questions, teachers can determine if students understand important points or distinctions raised in class. They need not wait until homework is turned in or exams are completed to do so. Instead they can receive feedback on a lecture during that same lecture.

  • ...Teach in a way that adapts to the immediate learning needs of his or her students. If a histogram of student answers shows that a significant number of students chose wrong answers to a question, then the teacher can revisit or clarify the points he or she just made in class. If a histogram shows that most students chose the correct answers to a question, then the teacher can move on to another topic.

  • ...Take attendance and to rapidly grade in-class quizzes, provided that each transmitter is assigned to a unique student over the length of a course. Note that different CRS systems provide different levels of support for anonymous and non-anonymous usage.

  • ...Add a little drama to class. There is often a sense of expectation as wait for the histogram to appear showing how their classmates answered a given question.

"Putting up your hand in class is pretty complex thing, kind of dangerous, socially and academically. But everyone is willing to give anonymous answers. Everyone is equally involved and the answers are honest. And fast."

-- Victor Edmonds, Educational Technology Services, University of California at Berkeley

For more on reasons to use a CRS, see our bibliography of scholarly articles on the effectiveness of CRS, organized by discipline.

Also, view this Purdue University video featuring interviews with faculty sharing reasons they use clickers.

Challenges in Using a CRS

While a CRS can facilitate a variety of student-active teaching activities, a teacher using a CRS should be aware of the following challenges.

  • As with any use of computer technology in the classroom, technical problems can arise. A teacher using a CRS should allow time at the beginning of class to set-up and troubleshoot the CRS. Also, non-CRS back-up activities should be planned in the event of a total CRS failure.

  • Getting started with a CRS takes some time. Current systems are easier to learn and use than older systems, but there is still some start-up time required. Having an experienced user around is helpful.

    Adapting lesson plans to take advantage of clickers takes time, too. However, it is often not hard to start small by adding a question or two to each class, particularly if the instructor has a good idea where students are likely to have difficulties.

  • Most CRS technology restricts teachers to posing multiple-choice questions, and writing effective multiple-choice questions can be challenging. Knowledge of common student mistakes and misconceptions can be useful in designing wrong answers to multiple-choice questions. Asking students open-ended questions and then adapting their responses into later multiple-choice questions can also be effective. Some instructors take student suggestions for answer choices during class. Others take advantage of existing banks of questions in their disciplines.

    For advice on writing multiple-choice questions, see Constructing Written Test Questions for the Basic and Clinical Sciences, a National Board of Medical Examiners booklet on writing effective test questions with advice on true-false questions, one-best-answer questions, extended matching questions, and avoiding "testwiseness" and irrelevant difficulty in questions.

  • Using a CRS in class takes up class time. If students do not keep possession of transmitters between classes, some time will be spent at the beginning of class distributing the transmitters. Moreover, a few minutes will be needed for students to transmit their answers, and class time will be used discussing student responses.

    Some teachers have responded to this challenge by relying on pre-class reading assignments to convey portions of course material. Others use the time limit function of a CRS (where students are given only so much time to respond to a given question) to help manage class time. Others feel that students need to master certain material before moving on, and using clickers to ensure that mastery is worth the extra time. Others feel that using clickers to get feedback on student understanding actually allows them to progress through material more quickly by determining what topics they can safely omit.

  • The wrong answers that students choose in response to a multiple-choice question can reveal that the students have misconceptions, but knowing that students have misconceptions does not necessarily reveal what those misconceptions are. Teachers using CRS questions sometimes find it surprising when large numbers of students choose certain wrong answers, and further classroom discussion is sometimes needed to explore why students chose the wrong answers they did.

  • When a teacher uses a CRS to check for student understanding during class, if it turns out the students do not understanding a particular concept or application, then the teacher may have to change his or her lesson plan "on the fly." This can be challenging for teachers who are used to preparing their lessons thoroughly in advance or who do not think on their feet as well as some. Instructors often must decide when to move on to the next topic, what to do about students who answer incorrectly when it is time to move on, what to do if only a small proportion of students get a question correct, and what to do if students are still confused after the instructor gives his or her best explanation.

  • Many instructors use clickers to lead into class-wide discussions, and leading class-wide discussions can be challenging for instructors used to just lecturing. See our Teaching Guide on discussions for advice on leading class-wide discussions.

"Sometimes students will have questions that as an instructor you might not have thought of. And I use them the next day in class by just bouncing them back to the students. Instead of explaining to them what the answer to the question is, I just pose their question [to the class using a CRS]. I've had some students come to me at the end of the lecture saying, 'Professor Mazur, that question you asked me, that was exactly the question I had.' And I look at the student and say, 'That was your question!'"

-- Eric Mazur, Professor Physics at Harvard University

CRS at Vanderbilt

Logistics

Several brands of CRSs are currently available at Vanderbilt, although there is significant movement toward adopting a single brand for use campus-wide. Features of these brands vary, but all include the following.

  • Transmitters ("Clickers"): In some schools, students purchase clickers at the bookstore. Sometimes these clickers are bundled with their textbooks. In other schools, faculty can borrow cases of clickers that can be brought into class and distributed to students when needed.

  • Receivers: A few years ago, infrared receivers needed to be installed in classrooms ahead of time. With the current radio-frequency technology, receivers can be as small as a flash drive and simply plug into the USB port of a computer. Depending on their school, faculty may find receivers available in certain classrooms or may be able to check out receivers by the day or by the semester from local instructional technology support centers.

  • Software: Typically, CRS software must be installed and run from an instructor's presentation computer. The software is typically available for free from the vendor's web site, so instructors can usually install it on their office computers or laptops. Software can also be found on certain classroom computers.

For instructions about using TurningPoint, the brand of clickers most commonly used on campus, in conjunction with OAK (Vanderbilt's course management system, powered by Blackboard), please see OAK's instructions for using TurningPoint. Students can register their clickers via OAK, and instructors can use TurningPoint to download class rosters from OAK and sync gradebooks with OAK.

Support by School

Different brands of CRSs are supported in some of the Vanderbilt schools and colleges. Currently supported systems for each school are listed below.

College of Arts & Science

The Learning Resource Center (LRC) in A&S supports the TurningPoint classroom response system by Turning Technologies. TurningPoint integrates with Microsoft PowerPoint, appearing as an extra toolbar within PowerPoint. This toolbar is used to design and present clicker-enhanced PowerPoint presentations.

TurningPoint offers two different kinds of clickers--the simpler RF model and the more flexible XR model that features an LCD screen. The LRC encourages A&S instructors to have their student purchase the more flexible XR model since some instructors will want to use it and so students won't have to purchase more than one clicker.

If you are an instructor in A&S who wants to use clickers, you should do the following.

  • Contact Jamie Adams (2-4855) at the LRC and let her know your course and classroom. Some of the larger A&S classrooms (Wilson 103, 115, 126; Furman 114; Buttrick 101, 102; Calhoun 109; Stevenson 4327, 4309) have TurningPoint receivers and software installed on the classroom computers. If your class meets in another room, Jamie can arrange to have a receiver and the software installed.

  • Contact Alyssa Spencer (3-2989) at the Bookstore and let him know your course and which type of clicker (RF or the preferred choice, XR) you wish to use. He can then order clickers for your students to purchase at the Bookstore.

  • Visit the TurningPoint web site to download a free copy of the software. You can then install this software on your computer and begin designing clicker-enhanced PowerPoint presentations.

  • For more information on using clickers in A&S, contact Jamie Adams (2-4855) at the Learning Resource Center.

Law School

The Law School's Information Technology Services team is investigating options for using clickers at the Law School. Contact BC Hatchett (2-2615) for more information.

Peabody College

Peabody's Technology Support Center supports the TurningPoint classroom response system by Turning Technologies, as well as the Interwrite Personal Response System (PRS) brand of CRS. A TurningPoint system is available in Mayborn 204, and portable Interwrite PRS systems are available for faculty to check out and use in any classroom. Contact Brian Smokler (2-6600) for more information.

School of Engineering

The Biomedical Engineering Department supports the TurningPoint brand of CRS. Software and receivers are installed on the classroom computers in Stevenson Center 5306, 5312, and 5326. Receivers are also available for check-out by faculty wishing to use the system on their laptops.

School of Medicine

The Medical School's Media Center supports the TurningPoint brand of CRS. Systems are installed in Light Hall 202, 208, and 214, and a portable system is available for faculty to check out and use in any classroom. Each first-year medical student has his or her own clicker, allowing any faculty member teaching these students to use them in the classroom. Contact Jeff Laughlin (2-6127) for more information.

School of Nursing

The School of Nursing's Instructional Media Center has experience working with faculty using the TurningPoint classroom response system by Turning Technologies. Contact Jerry Murley (3-3300) for more information.

Electronic Mailing List

The Vanderbilt Classroom Response System Users Group is an electronic mailing list designed to facilitate cooperation and collaboration among Vanderbilt University faculty and staff involved with the use of classroom response systems at Vanderbilt.

To subscribe to the mailing list, send an email to majordomo@list.vanderbilt.edu. The subject of the email does not matter, but the body of the email must contain the line "subscribe crs_users" (without the quotation marks).

Borrowing a CRS

If you are interested in borrowing a CRS for a single class in order to see one in action in the context of your own teaching or to determine if you're interested in using a CRS on a more regular basis, you can do so. The Center for Teaching has an TurningPoint brand CRS with 100 transmitters you can borrow for a class or two.

Contact Derek Bruff (2-7290) for more information.

News Articles

CRS at Other Schools


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