* International Conference in Statistics, organized by (isi) in Warsaw 1-9 Sept. 1975.

* International Conference for Development & Industrialization, Berlin, D.R. of Germany . June 1977.

* Third – seventh International Conference for Statistics & Computer Science &Social Research, Cairo .1978-1982.

* Work – shop in economics in Hamburg F.R. of Germany, June 1985.

* Work – shop in statistics, The Hague, Holland, May- June 1988.

* International Work- shop for African University Maseru, Lothoto, Feb. 1989.

* African University conference, Dar Es Salaam , 1989.