Online Education - Introducing the Microlecture Format — Open Education
http://www.openeducation.net/2009/03/08/online-education-introducing-the-microlecture-format/

Most college students would likely concur - fifty minute lectures can be a bit much. With current research indicating that attention spans (measured in minutes) roughly mirror a students age (measured in years), it begs the question as to the rationale behind lectures of such length.

For those interested, here are Penrose’s steps to creating a one minute lecture: 1. List the key concepts you are trying to convey in the 60-minute lecture. That series of phrases will form the core of your microlecture. 2. Write a 15 to 30-second introduction and conclusion. They will provide context for your key concepts. 3. Record these three elements using a microphone and Web camera. (The college information-technology department can provide advice and facilities.) If you want to produce an audio-only lecture, no Webcam is necessary. The finished product should be 60 seconds to three minutes long. 4. Design an assignment to follow the lecture that will direct students to readings or activities that allow them to explore the key concepts. Combined with a written assignment, that should allow students to learn the material. 5. Upload the video and assignment to your course-management software.