This result shows that when practice has low variability, we often adopt shortcuts that won’t necessarily generalize to the broader conditions of a task. These effort-saving maneuvers aren’t always conscious, so it’s not simply a matter of laziness. This is one reason I caution students when using flashcards for subjects like mathematics. If you’re not careful, it’s easy to design cards where you memorize the answer (x = 7) and not the method
— ❐ Variability, Not Repetition, is the Key to Mastery - Scott H Young