An organization is a social unit of people that is structured and managed to meet collective goals on an ongoing basis. An organization's structure establishes lines of authority, communication, and allocation of duties. There are four main types of organizational structures: tall, flat, virtual, and boundaryless. Job analysis is the process of analyzing jobs to determine their tasks, responsibilities, and requirements. It involves developing job descriptions that outline tasks and specifications that outline necessary skills. Human resource planning forecasts personnel needs, manages changes, utilizes existing staff productively, and promotes systematic career progression to help organizations achieve their objectives.