This document discusses dynamics of industrial buying behavior. It compares consumer and industrial buying processes, noting industrial buying is more complicated with multiple phases and decision makers involved. The main types of industrial buying situations are described as straight rebuy, modified rebuy, and new tasks. Stages of industrial procurement decision making are outlined as preliminary application, tender proposal, negotiation, order processing, and warranty/services. Roles in industrial buying centers, including buyer, user, influencer, gatekeeper, and decider are also summarized.