Previous empirical studies on determinants of interfirm knowledge transfer have been largely focused on knowledge transfer between symmetrical partners, where there are relatively similar levels of knowledge sophistication and complementary knowledge-transfer motives. Determinants of knowledge transfer between partners in asymmetric "market-exploitation" alliances, where there are large differences in capabilities, and in motives, of the collaborating partners, have been understudied. This article presents a qualitative case study-research of knowledge transfer in such collaborations in the Nigerian oil industry. Four cases of interfirm collaborative arrangements between foreign and local indigenous firms in the industry were studied and analyzed. Based on the results of the case study research, this article highlights the dominant role of partners' motivational characteristics, as against, their cognitive characteristics in the knowledge-transfer process of asymmetric market-exploitation alliances. It develops a set of theoretical propositions to expand the understanding of the key determinants of learning and knowledge transfer. K E Y W O R D S alliance learning, developing countries, interfirm collaborations, Knowledge-transfer determinants, Nigeria