Choice behavior in an interactive multiple-criteria decision making environment is examined experimentally. A "free search" discrete visual interactive reference direction approach was used on a microcomputer by management students to solve two realistic and relevant multiple-criteria decision problems. The results revealed persistent patterns of intransitive choice behavior, and an unexpectedly rapid degree of convergence of the reference direction approach on a preferred solution. The results can be explained using Tversky'  additive utility difference model and Kahneman-Tversky's  prospect theory. The implications of the results for the design of interactive multiple-criteria decision procedures are discussed.