Net promoter score (NPS) first captured the imagination of the C-Suite in the early aughts (2000-2009) due to the customer insights it provided and its simplicity. In a nutshell, it's a single number that tells companies how satisfied their customers are.

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https://www.cmswire.com/customer-experience/companies-are-misusing-net-promoter-scores-heres-how-to-fix-that/