How Lego Rebuilt Itself from Near-Bankruptcy Using Root Cause Analysis

By 2003, Lego was losing approximately $1 million per day. The Danish toymaker had tried to diversify: theme parks, clothing lines, TV shows, jewelry, and wild experimental sets that strayed from the classic brick. Meanwhile, digital toys and video games were growing rapidly.

The conventional explanation was that Lego was losing to digital entertainment — kids wanted screens, not bricks. But Knudstorp suspected the problem was deeper.

Knudstorp applied the Ishikawa Diagram (Fishbone) to systematically analyze the causes of decline across multiple categories:

• Product: Too many SKUs (over 12,000), many unprofitable. Sets had strayed from core brick-building to complex pre-molded pieces.
• Process: Supply chain had become enormously complex — too many unique components (12,000+ different pieces vs. the traditional small set)
• Market: Some digital competition, but core building play was still popular
• Strategy: Diversification into clothing, theme parks, and media had diluted focus and cash
• Culture: The company had lost confidence in its core product

The Iceberg Model revealed deeper layers:

• Event: Revenue declining, massive losses
• Pattern: Every diversification attempt failed; core product was neglected
• Structure: Innovation without financial discipline; no one tracked profitability per product line
• Mental Model: "We must diversify away from bricks because bricks are old-fashioned"

Knudstorp challenged this mental model directly: bricks weren't old-fashioned — they were timeless. The problem wasn't the product; it was that Lego had abandoned what made the product special.

He reduced SKUs from 12,000+ to a manageable number, cut unprofitable product lines, sold the theme parks, and refocused on the core brick system — while adding carefully chosen licensed themes (Star Wars, Harry Potter) that enhanced rather than replaced brick-building.

The turnaround was extraordinary:

• Lego went from losing $1M/day to becoming the world's largest toy company by revenue
• Profits grew 10x within a decade
• The Lego Movie (2014) earned $469M globally and revitalized the brand for a new generation
• Lego consistently ranks as one of the most respected brands in the world
• The company is now worth an estimated $9B+

The lesson: when a great company is failing, the answer is rarely "become something different." It's usually "become what you are, but better."