This document discusses calculating and analyzing customer lifetime value (CLV). It provides formulas for calculating CLV based on yearly gross contribution per customer, retention rate, discount rate, and retention costs. An example calculation is shown. The document also discusses how retention rate affects CLV and introduces the concepts of net promoter score (NPS) and customer likeability score to categorize customers. It proposes mapping customers on a "grid" based on these metrics to identify the most and least valuable relationships.