The inventor of the ideas behind SuperMemo has a fascinating site in which he explains how he uses the same principles to organize his life. http://www.supermem

The inventor of the ideas behind SuperMemo has a fascinating site in which he explains how he uses the same principles to organize his life. http://www.supermemo.com/english/contents.htm http://www.supermemo.com/english/contents.htm For instance, he states that "lifetime minimum cost of remembering a single well-formulated piece of knowledge can easily be estimated to fall into the range from 30 seconds to 5 minutes (minimum cost is the cost that is achieved using the optimally spaced repetition schedule). This estimation can be used in cost-benefit analysis in deciding which mission-critical pieces of knowledge should be subject to learning based on spaced repetition."