This document summarizes different organizational structures including line and staff structures and functional structures. It describes the key characteristics of line and staff structures, where staff specialists advise line managers but do not have authority over them. The advantages of line and staff structures include better discipline, flexibility, coordination and decision efficiency, while disadvantages include potential conflicts between line and staff and a lack of responsibility and coordination. It also outlines the structure of a functional organization where employees are organized by specialty, and how project managers may lack authority over resources in such structures.