Arguably nothing he’s done has meant more to Lego than sponsoring the research teams that embedded with families to understand how Lego kids live and play. “If I’m honest, I didn’t know what the strategy was,” Knudstorp confesses of his first couple years as CEO. “Lego had done what so many companies had done, which is to stretch the brand, and I wasn’t sure if [the crisis] was because Lego had stretched too far, or if it was just a very hard strategy to execute. At first I actually said, let’s not talk about strategy, let’s talk about an action plan, to address the debt, to get the cash flow. But after that we did spend a lot of time on strategy, finding out what is Lego’s true identity. Things like, why do you exist? What makes you unique?”

During ’05 and ’06, the Lego “anthros,” as the research teams have been called, discovered some underappreciated cultural gaps. The idea of creative play as conducive to learning, or even formal education, is an article of faith at Lego that goes back to its founder, who defended his decision to become a toymaker during the Great Depression by pointing out that all animals use play to develop their brains. In Japan, however, Lego found that study and play were more clearly delineated. Few Japanese parents bought Lego, as they do in Germany or the U.S., because they were “toys with vitamins in them,” as Lego senior director Søren Holm only half-jokingly puts it.

American boys, meanwhile, turned out to be the least free of any group Lego tracked. British and German boys are far more likely to play unsupervised in yards and wooded areas and even have greater latitude in decorating their bedroom walls. Among slightly older American boys, 9 to 12, building with Lego represented a rare chance to be left alone. (On one subject, boys of all ages and nationalities agreed: A castle without a dragon is worse than no castle at all.)

Lego won’t say how much it spent on its anthropology, but research went on for months and shattered many of the assumptions that had led the company astray. You could say a worn-out sneaker saved Lego. “We asked an 11-year-old German boy, ‘what is your favorite possession?’ And he pointed to his shoes. But it wasn’t the brand of shoe that made them special,” says Holm, who heads up the Lego Concept Lab, its internal skunkworks. “When we asked him why these were so important to him, he showed us how they were worn on the side and bottom, and explained that his friends could tell from how they were worn down that he had mastered a certain style of riding, even a specific trick.”

The skate maneuvers had taken hours and hours to perfect, defying the consensus that modern kids don’t have the attention span to stick with painstaking challenges, especially during playtime. To compete with the plug-and-play quality of computer games, Lego had been dumbing down its building sets, aiming for faster “builds” and instant gratification. From the German skateboarder onward, Lego saw it had drawn the wrong lessons from computer games. Instead of focusing on their immediacy, the company now noticed how kids responded to the scoring, ranking, and levels of play—opportunities to demonstrate mastery. So while it didn’t take a genius or months of research to realize it might be a good idea to bring back the police station or fire engine that are at the heart of Lego’s most popular product line (Lego City), the “anthros” informed how the hook-and-ladder or motorcycle cop should be designed, packaged, and rolled out.

Encouraged by what it had learned about boys, Lego sent its team back out to scrutinize girls, starting in 2007. The company was surprised to learn that in their eyes, Lego suffered from an aesthetic deficit. “The greatest concern for girls really was beauty,” says Hanne Groth, Lego’s market research manager. Beauty, on the face of it, is an unsurprising virtue for a girl-friendly toy, but based on the ways girls played, Groth says, it came, as “mastery” had for boys, to stand for fairly specific needs: harmony (a pleasing, everything-in-its-right-place sense of order); friendlier colors; and a high level of detail.