The conception of the lecture as needing to be a didactic event has been challenged by Meltzer and Manivannan (2002) and Sandry (2005) who maintain that lectures can involve active learning. However, Elliot (2005) sees difficulties in the encouragement of active learning with phenomena such as social loafing and evaluation apprehension causing audience members to be reluctant to participate. A possible solution to the encouragement of audience involvement in lectures is the use of an audience response system which allows audience members to participate anonymously.