In a 2003 Harvard Business Review article entitled “One Number You Need to Grow,” Fred Reichheld introduced the concept of a Net Promoter Score (NPS), which measures the loyalty that exists between a provider and a consumer. An NPS can be as low as −100 (everybody is a detractor) or as high as +100 (everybody is a promoter). An NPS that is positive (i.e., higher than zero) is considered good, and an NPS of +50 is excellent. The NPS is largely based on a single, direct question: How likely is it that you would recommend our company/product/service to a friend or colleague? If you have a high
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