Even a simple object-oriented application can quickly become complex as it evolves. Each new class, method, or feature means more state and abstractions to manage, which in turn increases complexity, maintenance, and time spent detangling legacy code. It takes effort and skill to keep your codebase simple. This book shows you how. Simple Object-Oriented Design: Create clean, maintainable application presents practical design principles you can use to keep an object-oriented codebase simple as it grows and changes. Written as a collection of practical techniques you can apply in any OO language, it offers tips for concise code, managing dependencies and modules, and designing flexible abstractions. Illuminating figures, real-world examples, and insightful exercises make each principle stick. What's Inside Writing simple, understandable classes, Flexible abstractions to extend your designs, Reducing the impact of coupling Readers should be familiar with an object-oriented language like Java, C#, or Python.