This document summarizes six strategies for managing organizational change that became prominent in the 20th century: organizational design, the excellence movement, empowerment, strategic downsizing, total quality management/business process reengineering, and teamwork. It provides details on how each strategy emerged and transformed approaches to change management, moving away from the rigid bureaucracy of the early 1900s toward more flexible structures aimed at innovation, customer focus, and treating employees as a resource rather than a cost. The document analyzes both the benefits and unintended consequences of each strategic approach to change.