There are three types of differentiation in organizations: horizontal, vertical, and spatial. Vertical differentiation refers to the division of labor by levels of authority and includes considerations of span of control. Organizations can have flat or tall hierarchies. Centralization and decentralization refer to where decision-making authority resides in the organization. Mechanisms for integration include hierarchy, direct contact, liaison roles, and teams. Standardization and mutual adjustment are approaches for coordination between differentiated subunits.