Knowledge workers increasingly use multiple devices such as desktop computers, laptops, cell phones, and PDAs for personal information management (PIM) tasks. This book presents an examination of users mental workload in this context, especially when transitioning tasks from one device to another. Three tasks were assigned to each user, related to Files, Calendars and Contacts. Users reported high frustration with current devices support for task migration, e.g. accessing files from multiple machines. Workload measures obtained using the subjective NASA TLX scale were able to...