Suppose you work on Google’s advertising team and need to decide whether ads should have a blue background or a yellow background. You think that yellow would attract the most clicks; your colleague thinks that blue is better. How do you make the decision?
In Google’s early days, the two of you might have debated the issue until someone caved or you both agreed to kick the decision up to the boss. But ultimately, it dawned on leaders throughout Google that many of these debates and decisions were unnecessary.
“We don’t want high-level executives discussing whether a blue background or a yellow background will lead to more ad clicks,” Hal Varian, Google’s chief economist, told us. “Why debate this point, since we can simply run an experiment to find out?”
Varian worked with the team that developed Google’s systematic approach to experimentation. The company now runs experiments at an extraordinary scale — more than 10,000 per year. The results of these experiments inform managerial decisions in a variety of contexts, ranging from advertising sales to search engine parameters.