There are three levels of managers - top-level, middle-level, and frontline managers. Top-level managers focus on long-term organizational concerns and stability. Middle-level managers act as a go-between the higher and lower levels, overseeing departments. Frontline managers are responsible for supervising day-to-day activities. Managers have nine roles that include leader, liaison, spokesperson, and decision-maker. Successful managers require conceptual, human, and technical skills.