The aim of this article is to study the motivations of the partners of the international joint ventures between emerging countries and developed countries, and the impact of these motivations on the performance. The analysis was conducted on 123 international joint ventures in Turkey. The main result shows that the motivations are complementary. The Turkish parents wish to share the expenses of Research and Development; master a new technology and obtain new resources. The foreign partners are more motivated by the diversification and the expansion; the access to new markets and the compatibility of the expectations with their local partner.