This document discusses organizational structures and changes within organizations. It defines an organization and describes common organizational structures like hierarchical, functional, project-based, and matrix structures. It also discusses informal organizations that can form within a company. The document outlines pressures for organizational change, both internal like staff promotions or new investments, and external like changing markets or regulations. It notes barriers to change like inertia but emphasizes that change should be managed through clear communication, leadership, and consideration of people.