Is lecture attendance just a flip of a coin

BACKGROUND In the sciences, the content of sequential lectures is often planned under the assumption that the majority of students present in the class have attended the previous sessions. To some extent, students are expected to be able to recall and understand the previously delivered content. During a study into the effectiveness of a novel lecture engagement strategy (Interactive Lecture Demonstrations, or ILDs) in a first-year introductory electronics unit (Mazzolini, Daniel, & Edwards, 2012), student-generated codes were used to anonymously track individual students’ responses to the ILD activities over successive lecture sessions. These codes offered an unintended proxy for attendance, with surprising results.