Book excerpt: Change management is a challenging and continuous process that requires a particular skill set for both leaders and managers. It is essential for leaders and change agents to understand and address the five most important questions: Why? What? Who? How? When? Inside, you’ll learn the concept of change management, its impact on the company’s business performance and sustainability, and the relevant issues associated with it. The author highlights the importance of sustainable development, including economic, environmental, and social elements and introduces different types of changes including planned, unplanned, incremental/marginal, transitional, and transformational ones. Various models of planned and unplanned changes are featured, including leaders as change agents; the concept of resistance, reasons, sources, and forms of resistance to change; definitions of values, attitudes, personalities, and perceptions of individuals; and how these determinants affect individuals’ behaviors, attitudes, and responses toward organizational change. Several organizational examples are provided throughout the book to illustrate how high-performance organizations grow their business.