Judith B. Munday, 2001
Retrieved online from http://www.hishelpinschool.com/learning/Bloom.html in 2002 and again on July 5, 2014
Edgar Dale in the 1950’s studied what kinds of information people remember the most and for the longest period of time. He concluded that when students "do the real thing," "simulate" the real thing, or teach others what they have learned, the retention rate is about 90% of what was taught.