Introduction: Writing histories of the OECD; Matthieu Leimgruber & Matthias Schmelzer.- From the Marshall Plan to global governance: Historical transformations of the OEEC/OECD, 1948 to present; Matthias Schmelzer & Matthieu Leimgruber.- A short guide to historical archives, online resources, and research materials on the OEEC/OECD.- Part I: Being part of the West.- Western European vs. all-European cooperation? The OEEC, the European Recovery Program, and the United Nations Economic Commission for Europe (ECE), 1947-1952; Daniel Stinsky.- A socialist developing country in a Western capitalist club. Yugoslavia and the OEEC/OECD, 1955-1980; Andrej Markovic & Ivan Obadic.- Shall we or shall we not? The Japanese, Australian and New Zealand decisions to apply for membership of the OECD, 1960-1973; Peter Carroll.- The construction of a Western voice: OECD and the first UNCTAD of 1964; Patricia Hongler.- Part II: Managing the economy.- From post-war reconstruction to multi-level neo-corporatism. The OEEC/OECD and steel during the Cold War; Wolfram Kaiser.- A crisis manager for the international monetary and financial system? The rise and fall of the OECD Working Party 3, 1961-1980; Kazuhiko Yago.- Peer pressure in Paris: Country reviews at the OECD in the 1960s and 1970s; William Gray.- 'Positive adjustments': the emergence of supply-side economics in the OECD and G7, 1970-1984; Samuel Beroud.- Part III: Coping with socio-ecological challenges.- The narrowing-down of the OEEC/OECD migration functions, 1947-1986; Emmanuel Comte & Simone Paoli.- Engineering the Free World. The emergence of the OECD as an actor in education policy, 1957-1972; Regula Bürgi.- Negotiating environment: The making of the OECD Environment Committee and the Polluter Pays Principle, 1968-1972; Iris Borowy.- Gendering development: the OECD's Development Assistance Committee, 1981-2000; Rianne Mahon.