What Is the Basic Idea of Retrieval Practice?

People engage in bad studying strategies because of a cognitive illusion. Retrievable practice is that the information is in front of you, and you're manipulating it. We don't actually have introspective access to how well we'll remember something later. And one of the wt things we use as a guess to figure out how well we remember something later is how difficult was it to understand or process this material. When it's very difficult, we naturally correctly predict that we will understand it less.