What is spaced repetition and why does it work?

Short Answer

Spaced repetition is reviewing information at increasing intervals, timed near when you’re about to forget. That spacing strengthens consolidation and makes later recall faster, more accurate, and longer-lasting.

Why This Matters

Because memory fades without retrieval, spaced reviews force you to repeatedly reconstruct the knowledge, which reinforces the underlying memory trace. It also prevents over-studying easy items, so your study time leads to more durable learning.

Where This Changes

It works best for material you can test (facts, terms, procedures). For complex skills, combine spacing with application, problem-solving, and feedback so you don’t only memorize fragments.