This paper recommends the use of a computer simulation about trade and tariff negotiations to reinforce and apply principles learned in undergraduate international trade courses and to provide students with an opportunity to use the advanced features of Symphony, a computer spreadsheet. This simulation is a game in which both the class and individuals earn performance points. The simulation highlights positive relationships between increased trade and reduced tariffs and reasons for difficulties in implementing global free trade. The paper describes: (1) the role of negotiation in trade and tariff theory; (2) the bases for negotiation in this simulation; (3) the parameters of the simulation; (4) the simulation's procedures; and (5) the steps in using a macro-based spreadsheet. (JHP)