This document provides an overview of management concepts including definitions, key concepts, levels, skills, roles, trends and challenges. It defines management as the process of using organizational resources to achieve goals through planning, organizing, leading and controlling. It describes management levels as first-line, middle and top managers. Key skills are conceptual, human and technical. Roles include interpersonal, informational and decisional. Trends incorporate empowerment and self-managed teams. Challenges involve globalization, ethics, diversity and technology.