Student Response Systems (SRS) are a great way to break up a lecture and to get students thinking and interacting, while enabling you to more effectively support their learning through gaining valuable information on their understanding (Trumbull and Lash, 2013).
The use of SRS typically involves the teacher asking questions for which immediate feedback is provided. Initially, SRS used dedicated devices or 'clickers', but today they increasingly make use of students' smartphones. This is a cheaper solution for the institution and incurs little or no cost to students, whose smartphones can be connected to the internet via wifi. Where tools involve voting by SMS, many students' mobile bundles often allow limitless (or implausibly high) quantities of free text messages. There are now a large number of Web services that allow teachers to ask pose multiple-choice questions to their students, collect the responses anonymously in real time and display a summary of the results.