The document provides an overview of different types of buyers in B2B sales and how sales methodology needs to differ based on the buyer and type of solution being sold. It discusses three main types of buyers - early adopters, early majority, and late majority - who have different expectations and purchase processes. For innovative solutions targeting early adopters, the vendor engages with customers from the "mentor" phase through the full purchase process. For mature solutions sought by early majority buyers, vendors engage at the "case" phase during a competitive procurement. Commodity solutions sought by late majority only involve vendor engagement at the final "transaction" phase.