Although debugging multi-threaded applications can seem daunting, the additional complexity of the testing process is simply a product of the complexity of the software, and the background and principles of debugging remain constant. A solid understanding of these principles allows developers to debug software as it is being developed, resulting in more efficient software creation and execution. This paper explores key elements of development that minimize disruption, including designing with debugging in mind, utilizing code review to eliminate errors early, and extending applications via trace buffers. The paper also prepares developers to take on increasingly complex debugging with confidence and experience.