Organizational structure refers to how job tasks are formally divided, grouped and coordinated within a company. The document discusses several types of organizational structures including pre-bureaucratic, bureaucratic and post-bureaucratic structures. Pre-bureaucratic structures are common in small companies and involve centralized decision making. Bureaucratic structures involve standardized tasks and a hierarchical structure. Post-bureaucratic structures aim to move away from rigid hierarchies through approaches like consensus-based decision making, empowering employees, and fostering adaptation.