Evidence-Based Study Techniques: What Actually Works According to Science

Quick Answer: The two highest-rated study techniques in the cognitive-psychology literature are practice testing (active recall) and distributed practice (spaced repetition) — both rated "high utility" in the landmark Dunlosky et al. 2013 review. The two most popular techniques — rereading and highlighting — are rated "low utility" in the same review. Most students study for hundreds of hours using techniques that don't work and skip the ones that do. The fix is mostly a matter of switching which behaviors you do, not adding more time.

Most students and lifelong learners rely on study techniques that feel productive but produce poor results. Rereading notes, highlighting textbooks, and cramming before exams are among the most popular study methods and among the least effective. This is not speculation. Decades of cognitive science research have tested these methods rigorously and the results are clear.

A landmark 2013 review by Dunlosky and colleagues evaluated ten common study techniques against the available research evidence. Their findings surprised many educators: the techniques students use most often ranked among the least effective, while the most powerful techniques were rarely used.

This article summarizes what cognitive science tells us about which study techniques actually work, which do not, and how to implement the effective ones in your own learning.

The High-Effectiveness Techniques

1. Retrieval Practice (Practice Testing)

Effectiveness rating: High

Retrieval practice means actively pulling information from memory rather than passively reviewing it. This can take the form of flashcards, practice tests, free recall exercises, or simply closing your notes and writing down everything you remember.

The evidence for retrieval practice is overwhelming. Hundreds of studies across different ages, subjects, and settings consistently show that testing yourself on material produces dramatically better retention than rereading the same material for an equal amount of time.

A classic study by Roediger and Karpicke (2006) illustrates the effect clearly. Students who read a passage once and then practiced recalling it remembered significantly more one week later than students who read the passage four times. The students who reread felt more confident in their knowledge, but the students who practiced retrieval actually retained more.

A follow-up study raised the bar further. Karpicke and Blunt (2011), writing in Science, pitted retrieval practice against concept mapping, an elaborative technique many instructors consider more sophisticated than plain self-testing. Students who practiced retrieval outscored the concept-mapping group on a test given one week later, even though the concept-mapping group had the source material in front of them while building their maps and the retrieval group did not. For a closer look at why this effect holds up across so many study designs, see our guide to the testing effect.

How to implement it:

After studying a section, close your materials and write down everything you can remember. Do not worry about completeness or organization. The struggle of trying to recall is what produces the learning benefit. After your recall attempt, check against the source material and note what you missed. Focus future practice on the gaps.

Use flashcards for factual knowledge, but make them actively rather than passively. When you see the question side, generate your answer before flipping to check. Self-testing that involves genuine retrieval effort is what works.

2. Distributed Practice (Spacing)

Effectiveness rating: High

Distributed practice means spreading your study sessions across time rather than concentrating them in one block. Studying a topic for one hour across three days produces significantly better long-term retention than studying it for three hours in one sitting.

The spacing effect is one of the most robust findings in all of psychology. It has been replicated hundreds of times since Ebbinghaus first documented it in 1885. The optimal spacing interval depends on when you need to remember the material. For a test one week away, studying every two days is ideal. For long-term retention, gradually increasing intervals, from days to weeks to months, produces the best results.

A large meta-analysis by Cepeda and colleagues (2006), published in Psychological Bulletin, pooled results from over 800 experiments and confirmed that spaced study beats massed (crammed) study at nearly every retention interval tested, with the advantage growing larger the longer the gap between studying and the final test. For more on the mechanism behind this effect, see our explainer on the spacing effect.

How to implement it:

Plan your study schedule in advance. If you have four topics to learn, do not study Topic A on Monday, Topic B on Tuesday, and so on. Instead, study all four topics each day, spending less time on each but returning to each one across multiple sessions.

For book learning and professional development, spaced repetition software automates the optimal scheduling. Tools like Chapterly use algorithms based on the spacing effect to determine exactly when you should review each piece of information for maximum retention with minimum time investment.

3. Interleaved Practice

Effectiveness rating: Moderate to High

Interleaving means mixing different topics, problem types, or skills within a single study session rather than focusing on one thing at a time. For example, rather than practicing 20 algebra problems followed by 20 geometry problems, you would alternate between algebra and geometry problems throughout your session.

Interleaving feels harder and slower than blocked practice, and students consistently rate it as less effective. But the research shows the opposite: interleaved practice produces significantly better long-term retention and, critically, better transfer to new situations.

The reason interleaving works is that it forces you to identify which approach or concept applies to each problem. In blocked practice, you already know the category, so you just execute the procedure. In interleaved practice, you must first figure out which procedure to use, and this additional discriminative effort strengthens learning.

How to implement it:

When studying multiple topics, alternate between them within each session rather than completing one before moving to the next. When practicing skills, mix different types of problems together. Accept that this will feel more difficult and less smooth than blocked practice. The difficulty is the point.

The Moderate-Effectiveness Techniques

4. Elaborative Interrogation

Effectiveness rating: Moderate

Elaborative interrogation means asking "why" and "how" questions about the material you are studying. Rather than simply reading that a fact is true, you ask yourself why it is true and generate an explanation.

For example, if you read that stress impairs memory consolidation, you would pause and ask "Why does stress impair memory?" and generate an explanation based on what you know about cortisol, the hippocampus, and the consolidation process.

How to implement it:

As you study, get in the habit of pausing after each key fact or concept and asking "Why is this true?" and "How does this work?" Generate an answer before looking it up. Even incorrect explanations produce learning benefits because the act of generating forces deeper processing.

5. Self-Explanation

Effectiveness rating: Moderate

Self-explanation means explaining to yourself what you are learning, step by step, as you learn it. It differs from elaborative interrogation in that it focuses on the process of understanding rather than asking why questions about specific facts.

When studying a worked example, a self-explainer would talk through each step: "First they did this because of that, then they applied this principle, which gave them this result." When reading a text, a self-explainer pauses after each paragraph and restates the key point in their own words.

How to implement it:

As you read or study, pause regularly and explain what you just learned in your own words. If you are working through examples, explain each step aloud or in writing. When your explanation falters, you have found a gap in understanding to address. This habit is closely related to the protégé effect: readers who study expecting to teach retain up to 28% more than those studying for a test alone.

The Low-Effectiveness Techniques

These techniques are popular but produce poor results relative to the time they consume.

6. Highlighting and Underlining

Effectiveness rating: Low

Highlighting is one of the most common study behaviors and one of the least effective. Multiple studies show that highlighting produces no significant improvement in retention over simply reading, and may actually hurt learning by giving students a false sense that they have done something productive.

The problem is that highlighting is passive. You read a sentence, decide it seems important, and draw a line through it. At no point do you actively process, organize, or retrieve the information. Highlighting can also lead to overreliance on the text: students review their highlights rather than practicing retrieval, which reinforces recognition rather than recall.

What to do instead: If you use highlighting, pair it with retrieval practice. After highlighting key passages, close the book and try to recall what you highlighted and why it matters. The retrieval is what produces learning, not the highlighting itself.

7. Rereading

Effectiveness rating: Low

Rereading is the single most common study strategy reported by college students, and it is consistently outperformed by almost every other technique. Rereading creates a feeling of fluency because the material becomes increasingly familiar with each pass, but this familiarity creates an illusion of learning. You recognize the information but cannot recall it independently.

What to do instead: Replace rereading with retrieval practice. One read followed by practice recall is more effective than three readings. If you feel the urge to reread, close the material and test yourself first. Only reread the specific sections where your recall was weak.

8. Summarization

Effectiveness rating: Low

Summarization is rated low primarily because most students summarize poorly: they copy phrases from the text rather than generating genuinely condensed explanations in their own words. When done well, summarization can be moderately effective, but it requires training and effort that most learners do not invest.

What to do instead: If you write summaries, force yourself to use entirely your own words and to write from memory rather than while looking at the text. This transforms summarization from a passive copying exercise into a form of retrieval practice.

9. Keyword Mnemonics

Effectiveness rating: Low for most applications

Keyword mnemonics involve creating a mental image that links a keyword to its meaning. While effective for some specific tasks like learning foreign language vocabulary, keyword mnemonics are difficult to scale and do not transfer well to conceptual learning.

10. Imagery for Text

Effectiveness rating: Low

Creating mental images while reading text can enhance retention for some material, particularly concrete, visual content. But for abstract or conceptual material, which makes up the majority of what students study, imagery provides little benefit.

Putting It All Together: An Evidence-Based Study System

Here is a study system built entirely on high-effectiveness techniques.

Step 1: Initial Study (Active Reading)

Read the material once with full attention. As you read, practice elaborative interrogation by asking why and how questions. Use self-explanation to ensure you understand each section before moving to the next.

Step 2: Immediate Retrieval

After finishing a study session, close all materials and practice free recall. Write down everything you remember. Check against the source material and identify gaps.

Step 3: Spaced Review

Schedule review sessions at increasing intervals. During each review, practice active recall before rereading. Use spaced repetition tools to automate the scheduling.

Step 4: Interleaved Practice

When studying multiple topics, mix them within and across sessions. Alternate between different subjects, problem types, and content areas.

Step 5: Ongoing Retrieval

Continue practicing retrieval at spaced intervals. Each successful retrieval strengthens the memory. Each failed retrieval identifies what needs more work.

This system feels harder than highlighting and rereading. That is because it is harder, and the difficulty is precisely why it works. Learning that feels easy usually is not producing durable knowledge. Learning that feels challenging, where you struggle to retrieve information and must work to make connections, is exactly the kind of processing that produces long-term retention. This is the core insight behind desirable difficulties in learning research: conditions that slow you down and create productive struggle during study are often the same conditions that produce the strongest long-term memories.

Quick-Reference: How the Ten Techniques Compare

Technique	Effectiveness	Extra Time Required	Best For
Retrieval practice	High	Low–moderate	Any material you need to recall later
Distributed practice	High	None — just rescheduling	Anything studied across more than one session
Interleaved practice	Moderate–high	None — just resequencing	Problem-solving, telling similar concepts apart
Elaborative interrogation	Moderate	Low	Conceptual material with clear causal relationships
Self-explanation	Moderate	Low–moderate	Worked examples, step-by-step processes
Summarization (done well)	Low–moderate	Moderate	Only when written from memory, in your own words
Highlighting	Low	Low	Nothing on its own; pair with retrieval practice
Rereading	Low	High	Nothing; replace with retrieval practice
Keyword mnemonics	Low for most uses	Moderate	Foreign-language vocabulary specifically
Imagery for text	Low	Low	Concrete, visual content only

Two of the highest-rated techniques, distributed and interleaved practice, cost nothing extra in study time. They are entirely about when and how you sequence study you were already going to do, not additional hours. That makes them the highest-leverage changes available to the average student — you get a large retention gain for zero additional time investment.

Applying These Techniques to Book Reading

If you are a reader who wants to remember more from books, the same principles apply. Read actively, not passively. After finishing a chapter, close the book and recall the key points. Space your reading across multiple sessions rather than marathoning through a book in one sitting. Connect ideas from different books through elaboration.

Tools like Chapterly are built on these exact principles. By capturing your most important highlights and surfacing them for retrieval practice at scientifically optimal intervals, Chapterly applies the highest-rated study techniques to your reading automatically. The science is clear on what works. The question is whether you will use it. If you are evaluating which reading retention tool to use, our comparison of the best Readwise alternatives for 2026 covers the leading options side by side.

Frequently Asked Questions

Which study techniques are most effective according to research?

The two highest-effectiveness techniques are retrieval practice (testing yourself on material rather than rereading it) and distributed practice (spreading study sessions over time rather than cramming). Both consistently outperform popular methods like highlighting, rereading, and summarization in controlled studies across subjects, age groups, and domains.

Why does highlighting seem to work even though research says it doesn't?

Highlighting creates the illusion of learning because it requires minimal mental effort while producing a visible artifact — you have "done something" with the material. But the cognitive science is clear: identifying text that someone else wrote requires almost no processing depth, and shallow processing produces weak memory traces. Highlighting can be useful as a first step to identify material worth reviewing, but the review itself must involve active recall, not passive re-reading.

How much time should I spend on retrieval practice versus initial study?

Research suggests spending roughly 50–70% of total study time on retrieval practice rather than initial exposure. Most learners do the opposite — they study extensively and test themselves briefly if at all. The most efficient approach is one thorough pass through material followed by repeated self-testing sessions spaced over time.

Does the subject matter affect which study techniques work best?

The core principles — retrieval practice, spacing, interleaving, and elaboration — work across subjects. However, the implementation varies. For factual knowledge (vocabulary, formulas, dates), flashcards work well. For conceptual understanding, self-explanation and elaborative interrogation are more appropriate. For complex problem-solving, interleaved practice is especially powerful. The key is matching the retrieval format to the type of knowledge you are building.

Can I apply evidence-based study techniques to nonfiction books?

Absolutely. Retrieval practice applied to books means closing the book after each chapter and writing down everything you remember before checking. Spaced repetition means reviewing key ideas at increasing intervals rather than moving on and forgetting. Tools like Chapterly automate this workflow for book readers specifically, applying the highest-rated study techniques without requiring you to manage the system manually.

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The techniques that actually work are testing yourself and spacing it out — Chapterly turns your book highlights into spaced-repetition reviews automatically. Try it free.