Bannaga Taha Al-Zubair, El-Zain El-Khalefa El-khder. OBSTACLES HINDERING THE IMPLEMENTATION OF STRATEGIC PLANNING FROM SECONDARY SCHOOL PRINCIPALS IN KHARTOUM STATE. managere [Internet]. 2021 Dec. 30 [cited 2026 Apr. 19];3(3):118-29. Available from: https://serambi.org/index.php/managere/article/view/81