Many companies have established International Joint Ventures (IJV) in a competitive environment in order to enter new markets. Despite the growth of this mode of cooperation, it remains risky and has a very high rate of failure. In this article, we provide a summary of the main determinants of IJV performance. We, then, focus on the key success factors of IJV established by GL events, a French company operating in the events sector. The analysis of these factors shows the influence of the internal (Goal congruity, Trust and Ownership structure) and external environments (national culture and Industry profitability) on the success of these IJV.