Abstract Since the first “development decade,” the OECD has played a key role in coordinating aid from Western countries to the Global South. Before that first decade, however, wide gaps in development separated its own member countries. Within it, therefore, a Technical Cooperation Committee (TECO) operated to provide knowledge and expertise to “intermediate development” Mediterranean countries. TECO, through a network of experts, concentrated and disseminated data, ideas, and economic policy practices to promote the “modernization” of countries not fully integrated into the international economic system and ruled by dictatorial or otherwise undemocratic regimes. On the one hand, the program concretized intra-European solidarity to spread economic development and prosperity; on the other hand, it allowed a close look at the reality of those countries. Then, beginning in the 1970s, reflecting the change in the prevailing economic culture, TECO incubated the guiding lines for the global public administration reform. This study reconstructs the history of TECO through documentation preserved in the OECD archives in Paris.