~ spaced practice is desirable difficulty

❐ What Study Gurus Get Wrong About Learning

Examples of instructional manipulations that create “desirable difficulties” (Bjork, 1994 ) include varying the conditions of learning rather than keeping conditions constant and predictable, distributing or spacing study or practice sessions rather than massing or blocking such sessions, using tests (rather than presentations) as learning events, reducing feedback to the learner, and providing “contextual interference” during learning (e.g., interleaving rather than blocking practice)

❐ Desirable Difficulties in Vocabulary Learning