In the early 1990s, a Swedish psychologist named K. Anders Ericsson walked into the Berlin Academy of Music with a question that would reshape how we think about talent. He asked the academy’s professors to sort their violin students into three groups: the best — students with the potential to become international soloists; the good — talented but a tier below; and a third group training to be music teachers rather than performers.
Then Ericsson did something nobody had done before. He didn’t just ask how much they practiced. He mapped exactly how they practiced.
The findings were striking. By age 20, the best violinists had accumulated an average of 10,000 hours of practice. The good ones had logged around 7,500 hours. The future teachers had put in about 5,000.
That 10,000-hour number would go on to become one of the most famous statistics in popular psychology. There was just one problem. Almost everyone got the point wrong.
What Gladwell Did With the Data
In 2008, Malcolm Gladwell published Outliers and turned Ericsson’s research into the “10,000-hour rule.” The idea was intoxicating: put in 10,000 hours at anything and you’ll become world-class. Practice enough and greatness is guaranteed.
The book sold millions of copies. The rule became gospel. And Ericsson was furious.
“This is a popularized but simplistic view of our work,” Ericsson later wrote in his own book, Peak: Secrets from the New Science of Expertise. He said Gladwell’s rule was “wrong in several ways.”
First, 10,000 hours was an average, not a magic threshold. Some of the best violinists had practiced significantly less. Experts in other fields required vastly different amounts of time. There was no universal number.
Second — and this was the point Ericsson cared about most — Gladwell didn’t distinguish between types of practice. He treated all hours as equal. In Ericsson’s view, that missed the entire finding.
“The difference between expert performers and normal adults reflects a life-long period of deliberate effort to improve performance,” Ericsson wrote in his original 1993 paper, published in Psychological Review. Not just effort. Deliberate effort. The adjective carried all the weight.
Three Kinds of Practice
Ericsson identified a hierarchy that most people still don’t understand.
At the bottom is what he called “naive practice.” This is showing up and going through the motions. Playing tennis twice a month and assuming you’ll improve. Running the same three-mile loop at the same pace every morning. Attending meetings without analyzing what you’re learning from them.
“This is naive practice in a nutshell,” Ericsson wrote. “I just played it. I just swung the bat and tried to hit the ball. I just read the math problems and tried to solve them.”
Most people spend their entire careers in naive practice. They have 20 years of experience that is really one year repeated 20 times.
The middle tier is purposeful practice. It has goals. It has feedback. It pushes you beyond your comfort zone. It’s better than naive practice. But it’s not enough.
At the top is deliberate practice. This is what the best Berlin violinists were doing. It has all the features of purposeful practice plus two critical additions: it targets specific weaknesses using techniques designed by expert teachers, and it involves immediate, high-quality feedback.
What the Best Violinists Actually Did Differently
The 10,000-hour headline obscured the most important finding in Ericsson’s study. It wasn’t just that the best violinists practiced more. They practiced differently.
The top performers spent significantly more time in what Ericsson called “solitary practice” — working alone on specific technical challenges identified by their teachers. They didn’t just play pieces they already knew. They isolated the passages that tripped them up and drilled those passages relentlessly.
Robert Pool, who co-authored Peak with Ericsson, described it this way: “The best violinists spent more time in activities that were specifically designed to improve their performance. They weren’t playing for fun. They weren’t performing. They were working on the specific things that would make them better.”
The less accomplished violinists spent more time in group rehearsals and informal playing — activities that felt like practice but lacked the targeted focus that drives improvement. They were logging hours without logging growth.
Here’s the uncomfortable part. Deliberate practice doesn’t feel good. The best violinists rated their solitary practice sessions as the least enjoyable part of their day. They also rated them as the most important. They had learned to separate enjoyment from value — a distinction that most professionals never make.
Why This Matters at Work
You’re probably not a concert violinist. But you are a professional who wants to get better at your craft. And Ericsson’s research has a direct message for you: the way most people try to improve doesn’t work.
Think about how professionals typically develop. They attend conferences. They read articles. They sit through training sessions. They accumulate years of experience. All of this feels like growth. Almost none of it qualifies as deliberate practice.
Deliberate practice requires four things. A specific skill to develop — not “become a better communicator” but “improve how I open presentations.” A technique designed to improve that specific skill. Immediate feedback on performance. And repeated refinement based on that feedback.
Geoff Colvin, the Fortune journalist who wrote Talent Is Overrated, spent years translating Ericsson’s framework into business contexts. “In most jobs,” Colvin wrote, “people get better for the first year or two and then plateau. They’re not getting worse. They’re just not getting better. And they stay on that plateau for the rest of their careers.”
The plateau isn’t caused by lack of talent. It’s caused by the shift from deliberate to naive practice. In the beginning, everything is challenging. You’re forced to focus. You get constant feedback because you’re making obvious mistakes. Then you reach competence, and the deliberate effort stops. You shift to autopilot. You’ve stopped practicing and started performing.
Building Deliberate Practice Into Your Work
The good news is that Ericsson’s framework is actionable. You don’t need a violin teacher. You need structure.
Start by identifying the sub-skills that matter most in your role. A manager’s job isn’t one skill. It’s dozens — running meetings, giving feedback, coaching underperformers, making decisions under uncertainty. Pick one. Make it specific.
Then find your version of Ericsson’s expert teacher. This might be a mentor, a coach, or simply a colleague who’s better than you at that specific thing. Study what they do differently. The key insight from the Berlin violinists is that high performers aren’t just working harder — they’re working on the right things with the right guidance.
Create practice opportunities that push you just beyond your current ability. If you’re working on giving feedback, don’t wait for annual reviews. Schedule short, focused feedback conversations every week. Prepare for each one with a specific skill to try. Debrief afterward. What worked? What didn’t? What will you try differently next time?
Build in immediate feedback loops. Record yourself presenting. Review your writing with a critical eye. Ask a trusted colleague to observe your next meeting and tell you one thing to change.
The Real 10,000-Hour Message
Ericsson died in 2020, still frustrated that the 10,000-hour rule had eclipsed the actual point of his research. In one of his last interviews, he returned to the theme that defined his career.
“The question is not how many hours you practice,” he said. “The question is what you do during those hours.”
You can spend a decade on autopilot or a year in deliberate practice and the person who chose the year will be further ahead. Hours are a vanity metric. The type of practice is everything.
The best violinists in Berlin didn’t just practice more. They practiced with intention, with expert guidance, with ruthless focus on their weaknesses. They were uncomfortable almost every day. And that discomfort — not the clock — was the engine of their excellence.
Your 10,000 hours are ticking either way. The only question is whether you’re spending them deliberately.