Alshikh Alhameem Yousif, S.H.I.A.T. 2026. Investigating Difficulties Encountered by Sudanese Secondary Schools in Implementing National Curriculum Policy . Omdurman Islamic University Journal for Human Sciences. 22, 2 (2026), 399-415. DOI:https://doi.org/10.52981/oiujhs.v22i2.3639.