Researcher must study number of credit hours estimated with 51 credit hours as a mandatory requirement for a PhD degree as follows 

6 credit hours mandatory course requirements

15 credit hours elective course requirements

30 credit hours for thesis

Researcher must study at least 60% of the courses in the field of the program's specific specialization in addition to those courses in the general specialization of such program or those corresponding to other sections, the other/or part of such courses can be studied from other courses in the general specialization of the master's program specialized in the student or corresponding master's programs in other departments