Management involves planning, organizing, staffing, directing, and controlling organizational activities to achieve goals. Managers play an activating role and are responsible for the success of an organization. A manager is defined as the person responsible for planning and directing the work of individuals, monitoring their work, and taking corrective actions. There are typically three levels of management in a large organization: senior/top management who make strategic decisions, middle management who carry out top-level decisions, and lower management who ensure plans are carried out. The key functions of a manager include planning work, making decisions, delegating tasks, solving problems, coordinating activities, setting targets, guiding subordinates, and controlling deviations from plans.