A Call Center can recognize opportunities for up-sell or cross-selling.

yes, no, unknown = 3 outcomes

product choices = 1,2,3,12,13,23,123 = 7 outcomes

timeframe = 1 month, 1 year, 2+ years, unknown = 4 outcomes

2x7x4 = 56 outcomes and 57th outcome being no

Then improve this by applying metrics from customer preference studies.