This chapter discusses the nature of organizational change, including the different types and paces of change. It describes four types of change on a scale from fine-tuning to corporate transformation. Change can be predictable and follow typical lifecycle patterns, or it can be complex and unpredictable. The chapter also provides guidance on diagnosing change situations by looking for breakpoints in areas like competitors, customers, and technology shifts that indicate change is needed. It notes that change problems can vary in difficulty, from well-bounded difficult problems to unbounded messy problems.