This is an experimental study of some aspects of a negotiation situation that may influence a bargainer's decisions about his or her positions and tactics. The experiment is an attempt to explore hypothesized relationships between these types of variables in the setting of a simulated international conference on environmental regulation. It is regarded as a next step in a progression of analytical work on these relationships. In order to place the experiment in that analytical context, a general discussion of the meaning of negotiating flexibility and of situational levers precedes a description of methods and results. A final section develops implications of the findings for further work on this topic.