Several studies have been done in the area of the general managerial knowledge and skills of managers. One of those studies is the concepts of managerial skills by Robert Katz (1955). Katz suggested that a manager should possess technical skills including specialized knowledge, analytical ability, and the ability to use tools and techniques of a specific discipline. A manager has to demonstrate the ability to work effectively both as a team leader and a teammember (human skills). In addition, a manager should have conceptual skills so that he can see the enterprise as a whole. Katz also stated that when moving up the managerial hierarchy, a manager needs more and more human and conceptual skills but less and less technical skills.In their study, Shenhar and Thamhain (1994) however, argue that the conceptual skill in Katz's model is too broad. They proposed a new model, which includes the managerial knowledge and skills in technical, human, operational, and strategic areas. They suggested that a manager should have technical knowledge and skills to work as a professional and to guide and direct others. A manager has to be familiar with the behavioral theories and science and be able to apply those theories in actual managerial settings. With knowledge and skills, a manager should be able to organize, operate, and control an organizational unit effectively. A manager should also have knowledge in business concepts including some understanding of other professional and technical fields. This will assist a manager in capturing the big picture of a business he is in so that he can direct and monitor its overall performance.