Section 1 covers theoretical and methodological approaches to the study of established and formal regionalism, emerging and informal regionalism, inter-regionalism, and levels of regionalism. Section 2 provides detailed case-studies of established and formal regionalisms: EU, NAFTA, ASEAN, SAARC, OAS, MERCOSUR, AU, ECOWAS, and SADC. Section 3 offers case-studies that investigate emerging and informal regionalisms in Oceania, the Arab League, BRICSAM, and the Commonwealth(s).