REFERANCES:

-Dr. Gaffer Mohamed Deuab- Dean Faculty – Faculty of Education Khartoum University –tel. +2499412810690 .Fax.+249-1-87-412054.

-Dr.Esam Edres Kmatoer. Head department of Instructional Technology – Faculty of Education Khartoum University –tel.0918204162 .Fax.+249-1-87-412054.