This case, a supplement to UVA-M-0842, follows Ali Hurbas's efforts to use data extracted from the Dunia data warehouse to establish potential customers' customer lifetime value (CLV). Hurbas plans to use a spreadsheet model to evaluate Dunia's various cross-selling activities and their effectiveness in creating the greatest CLV. First, students should explain how the spreadsheet reflects the way in which Dunia makes money from cross-selling. Then students should use the spreadsheet to conduct what-if analysis to see how combinations of activities might improve total CLV, and sensitivity analysis to understand how cost parameters and other parameters would affect profitability. A teaching note for this case series is available to instructors to aid in class preparation.