Organization structure refers to the pattern of jobs and groups in an organization. It is an important influence on individual and group behavior. Organization design involves management decisions that determine the structure. Key design decisions include how work is divided and specialized, how jobs are grouped, the span of control of managers, and how authority is distributed. Common structures are functional, geographic, product, and customer-based departmentalization. Mechanistic and organic models differ in their degree of centralization, formalization, and specialization. The matrix and virtual organization are alternatives that combine structural elements.