This thesis investigates the determinants and issues of gender diversity in the composition of corporate governance structures. The thesis aims at contributing to the debate on the feminization of corporate governance structures. It puts into perspective the ongoing debates on the economic value-added of gender diversity in corporate board of directors. Under the current discussions on the role and composition of corporate board in value creation, this thesis focuses on aspects related to competencies, and learning and innovation capacity. The research shows, in particular, the plausibility of the business case theory. The results clearly show that the feminization of corporate governance structures involve economic and managerial concerns. They stress that feminization brings distinctive expertise to corporate board of directors. It participates positively in good governance and as a result, carries out a competitive advantage for companies. In addition, financial market encourages the integration of women in corporate Board of Directors. Although the results call for caution in imposing bias gender diversity in corporate boards as an essential means of performance, the thesis concludes that companies must consider measures of feminization of their governing structures.