Relearning

Relearning, also known as the Savings Method, is a way of measuring retention by measuring how much faster one relearns material that has been previously learned and then forgotten. To illustrate, let's say you had memorized Martin Luther King Jr's  "I Have a Dream" speech at the beginning of your freshman year. It took you ten hours to memorize the entire speech. At the end of the school year, you had to relearn the material. But this time, you were able to recite the speech flawlessly after only five hours of studying. This would give you a savings of 50%, as it only took you half the time to relearn the material.