Communication skills. Air traffic controllers must be able to give clear, concise instructions, listen carefully to pilot’s requests, and respond by speaking clearly. Concentration skills. Controllers must be able to concentrate in a room where multiple conversations occur at once. For example, in a large airport tower, several controllers may be speaking with several pilots at the same time. Decision-making skills. Controllers must make quick decisions. For instance, when a pilot requests a change of altitude or heading to avoid bad weather conditions, the controller must respond quickly so that the plane can operate safely. Math skills. Controllers must be able to do arithmetic accurately and quickly. They often need to calculate speeds, times and distances, and they recommend heading and altitude changes. Organizational skills. Controllers must be able to coordinate the actions of multiple flights. They need to be able to prioritize tasks, as they may have to guide several pilots at