An organization is a social unit of people that is structured and managed to meet goals. Organizations have management structures that determine relationships between activities and members, and assign roles and responsibilities. Managers at different levels engage in different amounts of planning, organizing, leading, and controlling functions to achieve organizational goals. Managers fulfill decisional, interpersonal, and informational roles like being a leader, liaison, or monitor. Managerial skills needed include technical skills, conceptual skills, interpersonal and communication skills, decision-making skills, and diagnostic and analytical skills. These skills allow managers to perform tasks, think strategically, interact effectively, make good decisions, and analyze situations.