An increasing number of organizations have implemented executive information systems (EIS), hoping to improve the effectiveness of senior managers and to facilitate their work. The use of such systems is thus a necessary condition through which executive performance can be affected. This study aims at understanding the various factors related to EIS utilization, using as theoretical foundation a model from organizational behaviour. This model, developed by Triandis, leads us to hypothesize that EIS use (behaviour) is determined by EIS experience (habits), work group influence (social factor), user satisfaction with information, system access and assistance (affect), perceived consequences (of EIS use), EIS sophistication and presence of a hotline (facilitating conditions). Field data obtained from 38 executives in nine organizations allowed us to test and confirm the appropriateness of the behavioral model through correlation and regression analyses. The results of the study are shown to have implications both for researchers and practitioners.