Study Techniques, Ranked by Research: What Actually Works vs. What Just Feels Productive

Which study techniques actually work?

Most students choose study methods by feel. The ones that feel productive — rereading the chapter, dragging a highlighter across the key lines, writing a tidy summary — happen to be the ones that work worst. The methods that feel awkward and effortful are the ones that actually build durable memory.

We're not guessing here. In 2013, a team of cognitive psychologists led by John Dunlosky reviewed the evidence behind 10 common study techniques and rated each one's utility — how broadly and reliably it boosts learning across subjects, ages, and test types. The conclusion was blunt: two techniques earned a HIGH rating, three landed in the middle, and five of the most popular methods on campus came out LOW.

This post walks through that ranking, then turns the winners into a concrete plan you can run this week. The headline, if you want it now: test yourself, and spread it out.

How did Dunlosky and colleagues rank the 10 techniques?

Dunlosky and colleagues (2013), writing in Psychological Science in the Public Interest, scored each technique on how well it generalizes — across different learners, materials, study conditions, and the kinds of tests used to measure learning. A technique earned HIGH utility only if it reliably helped a wide range of students in a wide range of situations.

Two techniques cleared that bar. Three were promising but limited — they work, but the evidence is narrower or depends more on how skilfully you use them. And five widely used favorites came out underwhelming: they're not useless, but they're a poor use of limited study hours.

Here's the full ranking from that review:

• HIGH utility: practice testing (quizzing yourself) and distributed practice (spreading study over time).
• MODERATE utility: elaborative interrogation (asking why a fact is true), self-explanation (explaining the steps to yourself), and interleaved practice (mixing problem types).
• LOW utility: highlighting and underlining, rereading, summarization, the keyword mnemonic, and using imagery for text.
• Notice the pattern: nearly every method on the LOW list is something you do to material. Every method on the HIGH list is something you do from memory.

Why is practice testing the single best technique?

Practice testing — quizzing yourself instead of reviewing — topped the ranking because retrieving information from memory does more than measure what you know. The act of retrieval changes the memory, making it easier to pull up next time. Researchers call this the testing effect, and it's one of the most reliably replicated findings in learning science.

The cleanest demonstration comes from Roediger and Karpicke (2006). Students who studied a passage once and then repeatedly tested themselves on it remembered far more a week later than students who simply restudied the same passage the same number of times. The restudy group actually felt more confident in the short term — and lost more by the final test. Effort during review, not comfort, predicted what survived.

A 'test' here is anything that forces you to produce the answer with the source closed: a flashcard, a quiz, a blank-page brain dump, or a friend asking you to explain a concept. The format barely matters. What matters is that you generate the answer before you check it, and that failed attempts get flagged for another pass.

• Read or watch once to understand, then close the source — don't reread it three times.
• Do a brain dump: write everything you remember on a blank page, from memory.
• Turn every gap into a question-and-answer pair instead of a highlighted line.
• Quiz, don't review: see the question, answer out loud or on paper, then check.
• Be honest about 'almost' — if you couldn't say it cleanly, mark it wrong and revisit it sooner.

Why does spacing your study beat cramming?

The second HIGH-utility technique is distributed practice: the same total study time spread across several sessions beats cramming it into one. This is the spacing effect, and a large meta-analysis by Cepeda and colleagues (2006) found it holds up remarkably consistently — spaced study reliably outperforms massed study for long-term retention.

The mechanism is slightly counterintuitive: you want to let yourself forget a little between sessions. Reviewing something just as it's starting to fade forces a harder, more valuable retrieval, and each successful recall earns you a longer gap before the next one. Cramming skips that struggle, which is exactly why crammed material leaks out within days.

Practically, this means three 25-minute sessions on Monday, Thursday, and the following week beat one 75-minute session the night before. You don't have to track the intervals by hand — that scheduling is the entire job of a spaced repetition system, which brings a card back right before you'd forget it and pushes easy cards further out.

What about the middle-tier techniques — are they worth your time?

The three MODERATE techniques are genuinely useful, especially layered on top of testing and spacing. They tend to work best for certain materials or when you already have a base of knowledge to build on.

Elaborative interrogation means asking 'why is this true?' and answering it — instead of memorizing that arteries carry blood away from the heart, you explain why their thick walls make sense for high-pressure flow. Self-explanation is its cousin: as you work through a problem or proof, you narrate why each step follows from the last. Both force you to connect new facts to what you already know, which makes them stickier.

Interleaved practice means mixing problem types in one session instead of blocking them — practicing a jumble of derivative, integral, and limit problems rather than 20 derivatives in a row. It feels harder and messier, and that's the point: by forcing you to first figure out which approach a problem needs, it trains the discrimination you'll need on a real exam where problems aren't pre-sorted.

• Elaborative interrogation: for each fact, ask and answer 'why would this be true?'
• Self-explanation: narrate why each step of a problem or argument follows from the previous one.
• Interleaving: mix related problem types in a session instead of drilling one type to exhaustion.

Why do highlighting, rereading, and summarizing rank so low?

Highlighting, rereading, summarization, the keyword mnemonic, and imagery for text all landed in the LOW-utility tier — and the first three are probably what most students spend most of their time doing.

The problem is the fluency illusion. The more times you read a passage, the more smoothly it flows, and that ease feels like mastery. But fluency measures how easily text moves past your eyes, not how well it's stored. You reread your notes four times, it reads like a familiar song, you feel ready — then the exam asks you to produce the answer on a blank page and you freeze, because you trained recognition and the test demands retrieval.

Highlighting is the same trap with a moving hand. It feels active, but it mostly defers the actual thinking to a future session that often never comes, while the color on the page makes that text feel learned. None of these methods are forbidden — rereading once to understand is a fine first step. The mistake is making low-utility methods your main event when the same hours spent testing and spacing would do far more.

What's the high-utility study plan in practice?

Stack the two winners and you get the strongest evidence-based combination in studying: retrieve the answer (practice testing) on an expanding schedule (distributed practice). Layer the moderate techniques on top where they fit. Here's a week that does exactly that:

Flashcards are the cleanest form of this whole stack — a question on one side, the answer hidden, forcing you to produce it before you check, scheduled on a spacing curve. The one rule that matters: the cards have to come from your material, because a stranger's pre-made deck tests their syllabus, not yours.

This is the gap Cram is built to close. You feed it your own material — typed topics, lecture notes, a textbook PDF, or a web link — and it turns that into question-and-answer flashcards in seconds, then schedules the reviews with spaced repetition and an exam countdown so the right card returns right before you'd forget it. It works offline, needs no account, and there are no ads or data-selling — every card comes from your own source, never a pre-made set.

• Day 1: Read or watch each topic once to understand. Then close it and write question-and-answer cards from memory.
• Days 2–7: Quiz yourself on the cards daily. Mix topics in one session (interleaving) rather than blocking them.
• For tough facts, add a 'why is this true?' explanation (elaborative interrogation) to the back of the card.
• Let the schedule expand: cards you keep getting right come back less often; cards you miss come back soon.
• Final pass before the exam: brain-dump each topic on a blank page, then check against your cards to find the last gaps.

Sources

Every claim above traces back to one of these peer-reviewed studies.

• Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving Students' Learning With Effective Learning Techniques: Promising Directions From Cognitive and Educational Psychology. Psychological Science in the Public Interest, 14(1). — Reviewed 10 study techniques and rated their utility: HIGH = practice testing and distributed practice; MODERATE = elaborative interrogation, self-explanation, and interleaved practice; LOW = highlighting/underlining, rereading, summarization, the keyword mnemonic, and imagery for text.
• Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3). — Demonstrated the testing effect: repeated retrieval practice produces better long-term retention than restudying the same material, even though restudy feels more effective in the short term.
• Cepeda, N. J., Pashler, H., Vul, E., Wixted, J. T., & Rohrer, D. (2006). Distributed practice in verbal recall tasks: A review and quantitative synthesis. Psychological Bulletin, 132(3). — A large meta-analysis confirming the spacing effect: study spread out over time reliably beats the same amount of study massed into one session for long-term retention.