Managers coordinate and oversee the work of others to accomplish organizational goals. They are found in all types of organizations and at various levels from top managers to first-line supervisors. The main functions of managers are planning, organizing, leading, and controlling. Effective management requires skills in technical areas as well as human and conceptual skills. Globalization, diversity, ethics and innovation present challenges for modern managers. Studying management provides value by developing an understanding of its universal need and the rewards and challenges of being a manager.