This study develops and tests several hypotheses regarding the influence and the reliability of a range of variables related to the firm-specific interest of multinational corporations. This thesis presents an examination of foreign direct investment behaviour of the Triad countries’ firms from the firm-specific factors point of view using a large panel data covering 1985-2011. Adopting a firm-specific approach to FDI behaviour, it provides a two-stage analyses to find out (1) the probability of firm characteristics’ and firm specific factors’ affecting firms’ FDI decisions and (2) these factors’ role in determining the amount of FDI to be undertaken. Overall, empirical findings show support for the firm specific assets’ significant role in FDI behaviour.