This course teaches attendees how to design and build multimodal applications. The emphasis is on mobile applications that combine speech and graphics, but other input modalities such as pen or stylus and sensors are also discussed. Both designing and building multimodal applications are discussed as well. The design section covers such topics as the principles of multimodal design, how to determine whether multimodality is a good fit for an application, the components of a multimodal application, 10 key differences between voice-only and multimodal design, initiating voice input, the role of the graphical environment in supporting speech recognition, pros and cons of avatars, integrating touch and voice input, and accommodating different types of users. The development section includes topics such as multimodal platforms, development tools, standards, and evaluation of multimodal applications.