This document defines and describes different types of organization structures. It begins by defining organization structure as the layout of functional units, staff reporting patterns, and communication flows within an organization. The main types discussed are functional, project, matrix, and network structures. Functional structure organizes units by specialized functions, while project structure organizes by projects. Matrix structure combines these, and network structure facilitates communication across boundaries. The document also examines how structure impacts efficiency, productivity, and performance, before analyzing advantages and disadvantages of each type.