The main goal of this workshop is to bring together researchers and practitioners to share innovative ideas, discuss challenges, and brainstorm potential solutions to open research problems related to the domain of wrist-worn smart devices. Using sensors, computation resources, and communication interfaces available on smartwatches and smart bands, it is possible to capture information about the device user, perform computation to infer the user’s activities and their context, and communicate these to a smartphone or the cloud. These wrist-worn smart devices represent a perfect platform to conduct research on human activity and behavior. They introduce opportunities for exploring new research problems, such as efficient classification and computation on the wearable device, offloading of computation from the user’s watch to the phone or the cloud, enhancement of user experience, smart notification management, physical activity sensing, behavior modeling, and data analysis.