Real-time testing involves the use of a real-time environment to implement a test application. Engineers use real-time testing techniques primarily to achieve greater reliability and/or determinism in a test system. These techniques also play a critical role in the development of many of today’s products and systems. Examples include durability, life-cycle, and other test systems that operate for long durations or with extended operator absence requiring the reliability provided by real-time execution platforms. This white paper examines several real-time testing applications and discusses how they are evolving to meet challenges that test engineers face.