Testing and quality assurance (QA) are crucial to the success of any speech system, but testing IVR and multimodal systems presents unique challenges. Focusing on multimodal applications that involve speech and other modalities, we describe the multiple layers of testing and QA: engine quality, functional application, VUI, interfaces and infrastructure, load balancing, backup, and recovery. Learn how to do the following: Set the testing goals, targets, and success factors; specify and measure metrics; test and measure "soft" and "immeasurable" targets; test documentation in all stages; and manage a testing project and identify who should be on the testing team.