International bargaining and negotiation are subjects about which there has long been much speculation and the offering of much advice. Accounts of bargaining experiences, as well as the assembly and ordering of real-world data and inferences drawn therefrom (particularly when they lead to the maxims of a Callières, a Nicolson, or a Lippmann) raise questions that require investigation by all available means, including experimentation in laboratories when feasible. Laboratory investigation can be confined to overt behavior—proposals, arguments, threats, outcomes, and so on—or the laboratory can be employed to seek data on attitudes, intentions, expectations, and perceptions, and thereby to probe where historical data seldom penetrate. Computer technology adds flexibility, control, and efficiency to laboratory data collection. It permits, during the course of an experiment, questions that probe the subjective aspects of a negotiation without the distortion that results from the presence of an interrogator.