Uncover surprises risks and potentially serious bugs with exploratory testing. Rather than designing all tests in advance explorers design and execute small rapid experiments using what they learned from the last little experiment to inform the next. Learn essential skills of a master explorer including how to analyze software to discover key points of vulnerability how to design experiments on the fly how to hone your observation skills and how to focus your efforts. Software is full of surprises. No matter how careful or skilled you are when you create software it can behave differently than you intended. Exploratory testing mitigates those risks. Part 1 introduces the core essential skills of a master explorer. Youll learn to craft charters to guide your exploration to observe whats really happening hint its harder than it sounds to identify interesting variations and to determine what expected behavior should be when exercising software in unexpected ways. Part 2 builds on that foundation. Youll learn how to explore by varying interactions sequences data timing and configurations. Along the way youll see how to incorporate analysis techniques like state modeling data modeling and defining context diagrams into your explorers arsenal. Part 3 brings the techniques back into the context of a software project. Youll apply the skills and techniques in a variety of contexts and integrate exploration into the development cycle from the very beginning. You can apply the techniques in this book to any kind of software. Whether you work on embedded systems Web applications desktop applications APIs or something else youll find this book contains a wealth of concrete and practical advice about exploring your software to discover its capabilities limitations and risks.