This document provides an introduction to Net Promoter Score (NPS), a framework for measuring customer satisfaction and loyalty. It discusses how NPS works, including that it uses a single survey question that asks customers how likely they are to recommend a business on a 0-10 scale. Responses are categorized into Promoters (9-10), Passives (7-8), and Detractors (0-6) to calculate an overall NPS score. The document explains that NPS aims to provide useful customer feedback with minimal questions. It also provides tips for implementing an NPS program, such as scheduling relationship and transactional surveys.