Henri Fayol's 5 Functions of Managers and 14 set of principles known as General Administrative and Management Theory. Henri Fayol is a 20th century management researcher who developed the above study to understand what management is and what do managers do. Created by Muhammad Khalid, Razeen Jinnah, Abdul Basit Gaba, Samra Ayub and Zonish Munir, Students of BBA at Bahria University, Karachi Campus as part of assignment.