Much of Corporate America is obsessed with its net promoter score, or NPS, a measure of customer satisfaction that has developed a cultlike following among CEOs in recent years. Unlike profits or sales, which are measured and audited, NPS is usually calculated from a one-question survey that companies often administer themselves.
Last year, “net promoter” or “NPS” was cited more than 150 times in earnings conference calls by 50 S&P 500 companies, according to a Wall Street Journal analysis of transcripts. That’s more than four times as many mentions, and nearly three times as many companies, compared with five years earlier.
Executives pointed to strong or rising NPS as proof that shoppers preferred to pick up orders at Target Corp. stores or that Google’s newest Pixel smartphone was off to a good start. Out of all the mentions the Journal tracked on earnings calls, no executive has ever said the score declined.
.. The score was introduced in 2003 in a Harvard Business Review article titled “The One Number You Need to Grow.” The Bain & Co. consultant who wrote the article called NPS the “simplest, most intuitive and best predictor of customer behavior” and a “useful predictor of growth.”
.. Since then, the metric has taken on a life of its own, so much so that the inventor, Fred Reichheld, said he is astonished companies are using NPS to determine bonuses and as a performance indicator. “That’s completely bogus,” Mr. Reichheld, who still consults for Bain, said in an interview. “I had no idea how people would mess with the score to bend it, to make it serve their selfish objectives.”
The score is typically derived from customer responses to a single question that companies ask at the checkout register of a store or in an email or web pop-up online: On a scale of 0 to 10, how likely are you to recommend the company’s product or service to a friend? The survey usually includes a follow-up question asking customers to explain their ratings.
NPS is based on the premise that every company’s customers can be divided into three groups. People who answer 9 or 10 are “promoters,” or loyal enthusiasts who keep buying. Those who give a score of 0 to 6 are “detractors,” or unhappy customers. Those who answer 7 or 8 are considered “passives,” satisfied but easily wooed by competitors... Management consultants are notorious for pushing ideas to CEOs using jargon and claims of improved business performance. Total quality management, or TQM, which advocated installing quality programs at companies, and business re-engineering process, and BRP, which was a way to restructure companies, gained traction in the 1990s and then faded. NPS has outlived such fads, spawning a cottage industry of consultants and software firms that help businesses implement and boost their score.Some academics have questioned the whole idea, suggesting that NPS has been oversold. Two 2007 studies analyzing thousands of customer interviews said NPS doesn’t correlate with revenue or predict customer behavior any better than other survey-based metric. A 2015 study examining data on 80,000 customers from hundreds of brands said the score doesn’t explain the way people allocate their money.“The science behind NPS is bad,” said Timothy Keiningham, a marketing professor at St. John’s University in New York, and one of the co-authors of the three studies. He said the creators of NPS haven’t provided peer-reviewed research to support their original claims of a strong correlation to growth. “When people change their net promoter score, that has almost no relationship to how they divide their spending.”
Some data scientists said the way NPS is calculated, in which one survey metric is subtracted from another, increases the margin of error and requires a larger sample size to get useful results.
“It’s common for companies to track NPS data as if it’s gospel—not knowing that it’s super noisy by design,” said Kim Larsen, who has worked as a data scientist at several companies, including Charles Schwab Corp.
Bain, which now refers to NPS as “net promoter system,” said some companies are focusing too heavily on the score, but still defended the approach for some practical benefits. It is simple to communicate to employees, provides an easy way to follow up with customers and can be used to benchmark against rivals. The firm also said third-party analyses, including the 2007 studies, of whether NPS correlates with revenue aren’t as good as the analyses companies conduct internally.
“These are not stupid people. They are running large, successful companies,” said Rob Markey, a Bain partner who helps clients use NPS. “They have demonstrated to their own satisfaction that it’s good.”
Among the first companies to implement NPS were General Electric Co., Intuit Inc. and Charles Schwab Corp., whose leaders were convinced of the benefits after meeting with Mr. Reichheld and other Bain consultants. Now, hundreds of companies are using the score and many have tweaked the methodology, such as making the numerical scale 1 to 5 or including additional survey questions.
International Business Machines Corp. said it switched from a three-question survey to NPS in 2015. Employees in different departments can see the NPS feedback on their phones. “What it’s become here is a shared truth,” said Kathy McGettrick, vice president of market development and insights at IBM.
.. “A big challenge with the methodology is that organizations tend to focus on the metric as the objective instead of gaining the insight to learn and act on to improve the customer experience,” he said. “When organizations manage to the metric, they find ways to game the system.”
The results are easy to manipulate, whether intentionally or unintentionally. On Reddit posts, Best Buy employees share tips and tricks to improve NPS, which the company derives from a random sample of customers. They said they can get better results when they explain to customers how the scoring works, or tell them their compensation is connected to the result. Some said they remind only the happiest customers to take the survey.“When horrible NPS comments would come in, the management would rail at the employees,” said Alan Sabido, a former Best Buy employee who worked at a Las Vegas store for three years until he quit last year. Mr. Sabido recalled an instance when his store team received a bad score because a customer had a poor experience at a different Best Buy location.NPS took on a greater role after Hubert Joly joined as Best Buy’s chief executive in 2012. The company said it was administering the NPS survey question to customers who bought products as well as those who didn’t. Best Buy also made the metric one of the criteria used to determine bonuses... Delta executives describe NPS as the “true North Star,” she said, though the airline uses other customer metrics as well. “We have been able to statistically correlate our NPS performance with our revenue premium,” she said, referring to how much more Delta is able to charge than a competitor because of its brand.
.. It’s hard for investors to interpret the score because companies don’t typically share response rates, margin of error, or whether results are adjusted for cultural and other biases. Research shows , and Americans tend to give higher scores than consumers in some countries such as Japan and Korea.