In today's intensely competitive world, many firms have developed applications of information technology (IT) that provide a significant global competitive advantage. Most evidence of such IT use is anecdotal; the global competitive impact of IT has not been studied from a rigorous theory building or empirical perspective. This article reports progress toward the development of a model (called GLITS) to measure the strategic global impact of IT on an international firm. The underpinnings of the model are based on domestic and international literature; and it has undergone extensive refinement through statistical evaluation and validation. The model and its accompanying instrument can be used to identify specific strategic IT factors for a company and a contingency analysis can be conducted to determine the importance of various factors based on organizational characteristics. This foundational model should have significant utility for both practitioners and researchers.