In the present article, we have sought to identify the Islamic countries eligible to participate in the early nucleus of economic integration. In other words, our main question has been: by the key international macro-economic variables, which members of OIC have the capacity to actively participate in regional integration? Or, which countries enjoy the necessary qualifications for establishing the early nucleus of an effective regional economic integration among the OIC members?
To answer this question, using 16 key economic, international macro-economic and trade indices which have a bearing on regional economic integration, we have attempted to make taxonomy of OIC members and recognize the most suitable members for constituting the early nucleus of regional economic integration.In terms of our aggregate combined index of OIC members, our findings suggest that the United Arab Emirates, Turkey, Kuwait, Bahrain, Indonesia, Malaysia, Saudi Arabia, Iran, Egypt and Lebanon have, respectively, the highest numerical value and ranking.