Migration held computing and information access from stationary environments to mobile computing devices to be used eventually in the mobile environment, such as Personal Digital Assistants (PDAs), tablet PCs, next generation mobile phones, and the system drivers in-car assistance, raises critical challenges for human interaction computer-natural. Speech supports hands-free operation and eyes-free, and become a key alternative interaction mode in mobile environments, eg This book: chapter combines an overview of key areas in spoken multimodal dialogue (systems and components, architecture, and evaluation) with chapters focused on specific applications or problems in the field. Audience: Computer scientists, engineers, and others who work in the field of multimodal spoken dialogue systems in academia and industry. Graduate students and Ph.D. students specializing in spoken multimodal dialogue systems in general, or focus on issues in these systems in the mobile environment in particular.