Retention is Less Than 10% After 30 Days

Reference List: Many books, papers, and scientific studies have been published supporting this data. Here is a partial reference list with the most recent first:

Why Long Lectures are Ineffective. Time Magazine, Oct. 2012. Khan, Salman.

Creative Training Techniques Handbook – Tips, Tactics, and How-Tos for Delivering Effective Training (3rd ed.). HRD Press, 2003. Pike, Bob.

The “Change-up” in Lectures. (1996) The National Teaching & Learning Forum. Middendorf, Joan & Kalish, Alan.

Information Impact and Factors Affecting Recall. (1985) Paper presented at the Annual National Conference on Teaching Excellence and Conference of Administrators. Burns, Ralph.

Attention Breaks in Lectures. Education in Chemistry, March 1976, pp. 13, 49-50. Johnstone, A. H. & Percival, F.

Silent Messages (1st ed.). Wadsworth Publishing Company, July 1972. Mehrabian, Albert.

Über das Gedächtnis. (On Memory. Later translated to English as, Memory. A Contribution to Experimental Psychology (1885). Ebbinghaus, Hermann.