11) ________ is the term describing purchasing facilitated through the Internet. 12) Of the four stages of supplier selection, the stage at which the factor weighting approach would be used is ________. 13) Suppliers are also known as ________. 14) What is e-procurement? 15) What are the three classic negotiation strategies? Briefly describe each of them. 16) Identify the four stages of supplier selection. 17) Identify three common features of contracts between buyers and suppliers. 18) Describe a reverse auction (also known as a Dutch auction).