A method is provided herein that can adaptively determine the optional review cycle for different people and for different subjects. The method models the material as a number of learning focuses and the process of material's shifting from short-term to long-term memory as transition through a series of memorization states. Then, for each memorization state, the method performs reviews by evaluating the learning focuses and gathers relevant statistics about the evaluation result to dynamically determine whether the material has now in a next memorization state or when to conduct the next review on what learning focuses.