Summary
The author discusses the concept of the 'purist's model' of spaced repetition, emphasizing its strengths and limitations. The ideal model involves learning through creating flashcards, with software predicting when to review these cards based on memory decay. However, the interaction with facts in real life complicates this model, as remembering is influenced by various external factors and not just the spacing technique. The author concludes that while the purist's model serves as an ideal framework, it may not perfectly reflect the complexities of real learning applications.