#2. http://www.hishelpinschool.com/learning/Bloom.html
¥At the next level, we find that we are reaching the place where activity and application make our use of information "real" to us. Bruce Nyland in the 1950Õs 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.
¥Note: Bruce Nyland died in 1998 at the age of 62.  He was 14 years old in 1950 and 23 in 1959.