This document provides an overview of organization theory from a textbook. It defines organization theory as the study of how organizations are structured and designed. Organization theory takes a macro view of organizations, focusing on structure and effectiveness, while organizational behavior takes a micro view of individual and group behavior. The document discusses key concepts in organization theory including structure, systems perspective, life cycles, and open vs. closed systems. It also outlines the typical stages in an organization's life cycle from entrepreneurial to decline.