Professor Dr. Rajah was also appointed by the United Nations Industrial Development Organisation as a principal author of the 2009 World Industrial Report. He was also entrusted to use his Systemic Quad model to capture the role of strategic clustering in driving employment, wages and sustainable development in Argentina (automotive), Brazil (paper and pulp), Chile (salmon), Nigeria (computers and components), China (buttons), Cambodia (clothing), India (leather), Indonesia (automotive), Laos (agro-processing) and Malaysia (electronics).
He has also been a major contributor in the preparation of international development reports relating to industrial and science, technology and innovation policies in the developing world for the World Bank, UNIDO, UNCTAD, United Nations Development Programme (UNDP), UNESCO, World Intellectual Property Organisation (WIPO) and International Labour Organisation (ILO). Professor Dr. Rajah was appointed as the principal researcher or leader of these projects.
Professor Dr. Rajah currently serves as a Distinguished Professor of Economics at the Asia-Europe Institute, University of Malaya, and is in the process of editing two books, both of which are expected to be published by the end of 2019.