The Five Whys—The Ramen Shop Story

A Japanese ramen chain discovered 60% of negative reviews focused on “long wait times.” The store manager’s first instinct: the kitchen is too slow. He pressed the kitchen staff and even considered hiring more hands.

Instead, they applied the **Five Whys**—a method Sakichi Toyoda invented in the 1930s while working in a textile factory. The technique involves asking “why” five times until the root cause emerges.

1. Why do guests wait too long? → Because it takes over 15 minutes from order to food delivery.
2. Why does it take 15 minutes? → Because the kitchen reacts slowly after receiving the order.
3. Why is the kitchen slow to react? → Because the order slip printer has a delay.
4. Why the delay in printing? → Because the system gets congested during peak hours.
5. Why the congestion? → Because the buffer setting is too small.

The root cause wasn’t “slow chefs”—it was “buffer settings in the ordering system.”

Fixing it took 10 minutes at almost zero cost. Yet this single change reduced “long wait times” complaints by 70%.

If the manager had chosen to hire more staff instead, the problem wouldn’t have been solved. Labor costs would have risen, the kitchen would have become more crowded, and efficiency would have dropped.

Taiichi Ohno, architect of the Toyota Production System, said: “Ask why five times and you’ll find the real cause. Stop after two or three whys, and you’ll only uncover symptoms.”