What does science say: The best method to learn a language

There is no single best method to learn a language. Decades of research in linguistics and cognitive psychology have never crowned one method the winner, and anyone who promises otherwise is selling something. What the evidence does provide is more useful and more durable than a magic method: a handful of principles that reliably make learning stick — comprehensible input, spaced repetition, active recall, learning in whole sentences, and mixing your practice. The honest conclusion of two centuries of study is that the best method is the one you actually apply, consistently, over time.

That answer sounds anticlimactic, but it is the one that survives scrutiny. Studies comparing “methods” — grammar-translation, audiolingualism, the direct method, communicative teaching — rarely find one that beats the rest across all learners and all goals. What they find again and again is that certain ingredients show up wherever people succeed, whatever the branded method on the label. So instead of asking “which method is best?”, the more scientific question is “which principles are supported by evidence, and how do I build them into a routine I can keep?”

This article gathers those principles, names the research behind each, and — just as importantly — flags the popular claims that the science does not support.

What the research says works

A short list of findings has been replicated often enough to count as reliable guidance. None of them is a “method” on its own; together they describe how human memory and language acquisition actually behave.

Comprehensible input. You acquire language mainly by understanding messages slightly above your current level — Stephen Krashen’s idea of input at “i+1”. Material you can mostly follow, with a few new words or structures carried by context, is what feeds acquisition. This is now almost universally accepted as necessary for learning a language, even by Krashen’s critics. See our entry on comprehensible input.
Spaced repetition. Memory fades on a predictable curve, first measured by Hermann Ebbinghaus in 1885. Reviewing material at expanding intervals — rather than cramming it once — dramatically slows that forgetting. The principle was already spelled out by C. A. Mace in 1932 and is the backbone of every serious review system. More in the power of repetition and spaced repetition in language learning.
Active recall and desirable difficulties. Retrieving an answer from memory strengthens it far more than re-reading it. Roediger and Karpicke called this the testing effect; Robert and Elizabeth Bjork call the broader family of effortful, slower-but-stickier techniques desirable difficulties. Testing yourself feels harder than reviewing — and that difficulty is exactly why it works. See also Robert A. Bjork on desired difficulties.
Learn in sentences and chunks, not isolated words. The mental lexicon stores prefabricated formulaic sequences — collocations, phrases, ready-made expressions — not just single words plus rules. Learning whole sentences gives every word its grammatical context and lets grammar be absorbed by induction rather than memorised as rules. See learning in full sentences.
Interleaving. Mixing topics, skills and structures within a study session — rather than blocking one thing until it is “done” — improves long-term retention and the ability to tell similar items apart, even though it feels less smooth in the moment. See interleaving.
Sleep, motivation and goals. Memory is consolidated during sleep, so regular rest is part of the method, not a break from it. And because progress is slow, sustained motivation and well-set goals often decide who reaches fluency and who quits.

Notice what these principles have in common: they are about how you handle material over time — spacing, retrieving, mixing, understanding, sleeping on it — not about a particular textbook, app or teaching philosophy. That is why they transfer across languages, ages and learners.

What science does not confirm

Just as useful as knowing what works is knowing which popular ideas the evidence has failed to support — because chasing them wastes the time and motivation that the principles above depend on.

“Match the method to your learning style.” The idea that each of us is a “visual”, “auditory” or “kinaesthetic” learner (the VAK model) and learns best when material is delivered in “our” channel is one of the most widespread beliefs in education — and one of the least supported. A landmark review by Pashler and colleagues (2008) found no credible evidence for the “meshing” hypothesis, and later studies have repeatedly failed to confirm it. What helps is matching the format to the content (you learn pronunciation by listening, spelling by seeing), not to a personality label. See the learning styles VAK is dead.

“Fluent in three months.” Headline timelines like this — popularised in the polyglot community by figures such as Benny Lewis — are motivating but misleading if read literally. You can reach a useful conversational level fast with intense daily effort, but genuine fluency in a language unrelated to your own typically takes hundreds of hours of contact spread over a long period. Realistic estimates put basic working competence at several hundred hours, which is why we describe it as roughly an hour a day for a couple of years. See Benny Lewis and the polyglot community.

“Just absorb it — learn like a child.” Adults are not children, and cannot rely on exposure alone. Because adult learning has to pass through declarative memory before becoming intuitive, and the ease of native acquisition fades with age (the critical period), adults need deliberate, conscious practice — the very effort the “effortless immersion” pitch promises to avoid.

Method versus consistency

Here is the finding that most people underestimate: the difference between two good methods is usually smaller than the difference between doing something every day and doing it sporadically. Spaced repetition only works if the repetitions actually happen. Comprehensible input only accumulates if you keep meeting the language. Desirable difficulties only pay off over months. Every principle on the list above is a statement about behaviour over time — which means the limiting factor is almost never the choice of method, and almost always consistency.

This is why a modest routine you keep beats an optimal routine you abandon after two weeks. A learner doing twenty focused minutes a day, every day, with spacing and self-testing, will out-learn someone who switches methods every month looking for the perfect one. The perfect method does not exist; the perfect method for you is the sustainable one.

How to build your own system

Because the principles are portable, you can assemble them into a routine that fits your life. A workable system looks roughly like this:

Feed yourself understandable input daily. Read and listen to material you can mostly follow — on topics you already care about, since familiar content is easier to understand and remember. Push slightly above your level so there is always something new to pick up.
Turn what you meet into items you review with spacing. Collect the sentences and chunks you want to keep and revisit them at growing intervals rather than cramming. Prefer whole sentences to bare words so grammar comes along for free.
Test, don’t just re-read. Cover the answer and recall it. Accept that this feels harder — that is the desirable difficulty doing its job.
Mix it up. Interleave topics, tenses and skills within a session, and vary where and when you study.
Produce and interact. Understanding is necessary but not sufficient; speaking and writing force you to notice gaps. Seek conversation, a tutor or exchange partners, and prioritise being understood over being perfect.
Protect sleep and motivation. Consolidate with regular rest, set meaningful goals, and design the habit so it survives bad days.

A language app or course is a companion to this system, not a replacement for it — a convenient way to deliver input and manage spaced review, best used in sync with real reading, listening and conversation.

What this means for language learning

Stop hunting for the one method. Adopt the evidence-backed principles instead — comprehensible input, spaced repetition, desirable difficulties and learning in chunks — and build them into a routine.
Make consistency the goal. A method you keep beats a better method you drop. Design for daily, sustainable practice before optimising the details.
Ignore the myths. Learning styles and “fluent in three months” cost you time and motivation without delivering; spend that energy on the principles that replicate.
Combine input with output. Understand a lot, then push yourself to produce. An approach that unites both — massive comprehensible input plus practising full sentences from day one — is the core of the Taalhammer method.

Frequently asked questions

What is the best method to learn a language?

There is no single best method. Research consistently supports a set of principles rather than one technique: understanding input slightly above your level, reviewing with spaced repetition, testing yourself instead of re-reading, learning in whole sentences, and mixing your practice. The most effective “method” is whichever routine lets you apply these principles consistently over time.

How many hours does it take to learn a language?

It depends on how close the target language is to one you already know and on the level you want, but useful working competence typically takes several hundred hours of contact — on the order of an hour a day for a year or two. Claims of fluency in a few weeks describe a basic conversational level under intense effort, not full command of the language.

Do learning styles matter when learning a language?

No — not in the way the popular “visual/auditory/kinaesthetic” theory claims. Reviews of the evidence have found no support for tailoring instruction to a supposed personal learning style. What matters is matching the format to the content (listen to learn pronunciation, read to learn spelling) and using techniques that work for everyone, such as spaced repetition and active recall.

Sources

Ebbinghaus, H. (1885). Über das Gedächtnis (Memory: A Contribution to Experimental Psychology). Leipzig: Duncker & Humblot.
Mace, C. A. (1932). The Psychology of Study. London: Methuen.
Krashen, S. D. (1982). Principles and Practice in Second Language Acquisition. Oxford: Pergamon Press.
Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255.
Bjork, R. A., & Bjork, E. L. (2011). Making things hard on yourself, but in a good way: Creating desirable difficulties to enhance learning. In Psychology and the Real World. New York: Worth.
Pashler, H., McDaniel, M., Rohrer, D., & Bjork, R. (2008). Learning styles: Concepts and evidence. Psychological Science in the Public Interest, 9(3), 105–119.
Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students’ learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58.
Wray, A. (2002). Formulaic Language and the Lexicon. Cambridge: Cambridge University Press.
Walker, M. (2017). Why We Sleep: Unlocking the Power of Sleep and Dreams. New York: Scribner.