Scientists Found the Most Effective Way to Learn in 1984. It Was Too Expensive to Use. Until Now.

I get the same email every week.

"Kris, I've been learning Spanish for two years. My streak is huge. My vocab is decent. But the moment somebody speaks to me in Spanish, I freeze."

If that's you, I want to show you something.

It's a study from 1984, and it explains exactly what's going on.

The 2 Sigma study

In 1984, an educational psychologist named Benjamin Bloom published a paper called "The 2 Sigma Problem."

His team compared students learning the same material three ways.

1. Regular classroom.
2. Classroom with better methods.
3. one-on-one tutoring.

The result was not close.

The average student with a private tutor performed better than 98% of the students taught in a regular classroom. Two full standard deviations better. That's where the name comes from.

In education research, that’s about as big as effects get. Forty-two years later, people are still trying to match it.

So why isn't everyone learning this way?

Bloom answered that too. He called it a "problem" because one-on-one tutoring was "too costly for most societies to bear on a large scale." The best method was sitting right there. Almost nobody could afford it.

Keep that in mind. We'll come back to it.

Why your app can't get you there

I’ve tested language apps on this site for over a decade. I’ll be fair to them: they’re a decent way to start. You learn vocabulary, basic grammar, maybe build a daily habit. All of that is helpful.

But think about what tutors from the Bloom study are actually doing.

A tutor watches you attempt something, catches the exact moment you go wrong, and fixes it on the spot. Then makes you try again.

The feedback loop is immediate. You fix the mistake while it’s fresh, then go again.

An app cannot do that. It shows you Spanish and checks if you recognize it. Tapping the right word is recognition. Holding a conversation is production. They're different skills, and practicing one doesn't give you the other.

Maybe you’ve had this happen.

Someone speaks to you in Spanish. A live interaction, with a real human who is standing there waiting. You’ve spent two years memorizing vocab and grammar, but had zero minutes of actual speaking practice. All recognition, no production.

So obviously, you freeze.

You’re not bad at languages. You’ve just been skipping half the process: speaking.

The math that used to kill this idea

The obvious fix is a private tutor. And here's where most people stall, the same way Bloom said they would.

Online tutors typically run $15 to $50 an hour. Let's say you want to do an average of one hour a day to learn Spanish fast. Do the math and daily practice costs somewhere between $450 and $1,500 a month.

For most people, that doesn't fit into a Spanish budget. That's a second rent payment.

So learners do the rational-feeling thing: one lesson a week, apps in between. And progress crawls, because one hour of production practice a week is a trickle.

If you don’t have an hour a day to invest, keep reading. I found a solution for you too.

The loophole

This is the part I'd want someone to tell me about.

There's a Spanish school called BaseLang that flipped the pricing model.

Instead of charging per hour, they charge a flat monthly rate for unlimited one-on-one classes with native Spanish-speaking teachers.

It's basically like a gym subscription, but for your Spanish. So whether you do 10 hours a month or a hundred hours, the price stays the same.

Classes happen on Zoom, and they have over 300 teachers from seven countries who are available 24/7. You can book a class literally at the last minute.

Unlimited is the word that matters.

With per-hour tutoring, every extra class costs more, so bingeing on the one thing that will actually make you fluent is exactly what you can't afford to do.

Flip the model and the opposite happens: every extra class you take makes each hour of private tutoring cheaper.

Think about what that does. For the first time, the system rewards you for showing up more. Take more classes and you win twice: your cost per hour drops, and your Spanish improves faster.

That's the exact opposite of how paying for tutoring has always worked.

And if an hour a day is more than your life allows, there’s a lighter version of the same idea built for busy schedules. The quiz below factors the time you actually have into your plan, so you’ll see which version fits before you spend anything.

In other words, the thing Bloom said society couldn’t afford is now priced like a gym membership.

I've taken BaseLang classes myself and written about it on this site before.

The short version: the teachers were patient, energetic, and good at catching mistakes mid-sentence. The curriculum runs ten levels, from zero to advanced, and the whole method is built around speaking from your first class. Teachers update your progress sheet after each class, so that even when you switch teachers, you pick up exactly where the last one left off.

Forbes called it "the closest thing to immersion you can get without moving to a Spanish-speaking country." More than 20,000 students use it, and they took over 770,000 classes in the last 12 months.

The honest part

I don't recommend BaseLang to everyone, and I'd rather tell you that now.

It teaches Latin American Spanish, with teachers from seven countries, including Venezuela, Colombia, Mexico and Argentina. If you want to learn from someone with a Castilian accent (from Spain) this isn't your school.

And the flat fee only works if you show up. Unlimited classes you don't book cost the same as unlimited classes you do. The students with the big results, like Sam, who went "from knowing zero Spanish to being able to hold conversations with locals in 2 months," are the ones who treated it like Bloom's study: lots of one-on-one hours, not one token lesson a week.

If you'll realistically practice 15 minutes a week, use a free app instead. This is for people who are done being stuck, and for beginners who'd rather not get stuck in the first place.

Find out why you're stuck first

Here's what I'd actually do next, and it's free.

BaseLang built a short quiz that diagnoses where your Spanish has stalled. It matches your answers against six common stuck patterns: freezing in conversation, vocab that won't come out, motivation that dies after week three, and so on. Different problems need different fixes, and the quiz works out which one is yours.

Haven't started learning Spanish yet? Take it anyway. One of its answers is literally "this is my first real try." It works out where your plan should begin, and BaseLang's curriculum starts at absolute zero. Their teachers speak English and say that complete beginners are often the easiest students to teach: no bad habits to undo.

It takes about two minutes. It's free, and no card is needed.

TAKE THE 2-MINUTE QUIZ →

Two things happen at the end.

First, you get your result: your Stuck Score, why you're stuck, and what the fix looks like for your specific situation and schedule.

Second, BaseLang gives you a trial week for $1. Seven days of one-on-one classes with native teachers, starting with a welcome class where an English-speaking teacher places you at the right level. If it's not for you, you can cancel in two clicks and you’re only out a dollar.

There's also a safety net on the full program: if you're not happy in the first 35 days, BaseLang refunds everything and adds $20 on top for your trouble. I've never seen another language company do that.

The best way to learn has been known since 1984. Bloom proved it back then. The only thing standing in the way was the price, and that part is now solved.

The only question left is which specific thing is holding your Spanish back. Or, if you're starting from zero, where your plan should begin.

TAKE THE QUIZ AND CLAIM YOUR $1 WEEK →

Individual results depend on how much you practice. BaseLang offers a 35-day money-back guarantee on its Real World plans. Sponsored by BaseLang; see disclosure above.