The most commonly used customer feedback method today is called Net Promoter Score (NPS). This methodology was introduced in 1993 (not 2003 as widely reported on the internet) and was then promoted and commercialized by Bain and Co. in 2003 with the Harvard Business Review article "The One Number You Need to Grow". NPS is popular but that doesn't mean it's good Like so many other things, just because it's popular doesn't mean its good - take your pick at some modern pop music

Customer satisfaction is nothing new The earliest documented written customer complaint dates back to around 1750 BC and was written on a clay tablet by a copper buyer named Nanni to a merchant named Ea-nasir. The buyer complained that the quality of the copper ore was less than expected, there was a delay in delivery, and he had not been treated properly by the salesperson. In many ways, not a lot has changed in terms of customer experience in the almost 4000 years that have