· The Modelling of Economic Planning Development Processes, joint international conference by Erasmus University Rotterdam and Institution of Social Studies, The Hague, October 1980. Organisers: S.I.Cohen and R.Teekens.
· Parallel Economies and the Development Process, joint workshop of the International Labour Office, Geneva, and the Foundation for Economic Research Rotterdam, Erasmus University Rotterdam, 21-22 November 1990. Organisers: S.I.Cohen and E.Lee.
· Economics of Restructuring . Three workshops sponsored by European Community/Action of the Community in the field of Economics (EC/ACE). I. Nieborov (Poland), 27-28 October 1991. Organisers: S.I. Cohen and L. Zienkowski. II. Budapest, 14-15 May 1992. Organisers: S.I. Cohen and E. Zalai. III. Sofia, 19-20 December 1992. Organisers: S.I. Cohen and. S. Statev.
· Economics Teaching and Related Research for the Commonwealth of Independent States (CIS), Rotterdam, 10-12 December 1992. Conference sponsored by the International Economic Association. Organisers: S.I.Cohen and Y. Kouzminov.
· International Workshop on Comparative Poverty Research, Rotterdam, 9-10 May 1993. Conference sponsored by the International Social Science Council. Organisers: S.I.Cohen & A.B.Atkinson.