What categories of managerial skills support managerial success?

"In order to be successful in planning, organizing, leading, and controlling, managers must use a wide variety of skills. A skill is the ability to do something proficiently. Managerial skills fall into three basic categories: technical, human relations, and conceptual skills. The degree to which each type of skill is used depends upon the level of the manager’s position as seen in Exhibit 6.8. Additionally, in an increasingly global marketplace, it pays for managers to develop a special set of skills to deal with global management issues."