The term Wearable Technology encompasses a wide spectrum of devices, services and systems for wireless communications and the web. This book discusses the characteristics and design elements required for wearable devices and systems to be widely adopted by the mainstream population for use in their everyday lives. This book introduces concepts such as Operational Inertia that form a mindset conducive to designing wearables suitable for broad adoption by consumers. Wearables are by their nature closely associated with the person, and their use generates social and legal issues that may have little to do with specific technologies. This book discusses these implications, which can pose the greatest impediment to the successful adoption of the technology. The book is structured to meet the needs of researchers and practitioners in industry, and can also be used as a secondary text in advanced-level courses in computer science and electrical engineering.