The challenge of evaluating the effectiveness of space repetition

When using space repetition systems for learning, it often feels less effective than other methods, even though research shows its effectiveness. This discrepancy in perception could be due to the gradual progress that is easy to miss with space repetition. Unlike cramming, which provides the immediate satisfaction of instant knowledge, space repetition leads to subconscious acquisition of knowledge over time. This gradual internalization makes it less noticeable, which can make it feel less effective.