Which customer feedback metric was invented by Fred Reichheld in 2003 that revolutionized how companies measure customer loyalty with a single question?

In the world of product development and consumer research, measuring customer satisfaction has evolved dramatically over the decades. One particular metric revolutionized how companies evaluate and act upon customer feedback, becoming an industry standard used by thousands of organizations worldwide. Test your knowledge about this groundbreaking invention that changed how businesses understand their customers.

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Net Promoter Score (NPS)
Customer Satisfaction Index (CSI)
Customer Effort Score (CES)
Voice of Customer Index (VCI)