A contemporary book devoted to the topic of transparent electronics would likely employ one of two formats ¿ a monograph or an edited, mul- contributor compilation. Trade offs are inherent in the adoption of either of these options. A monograph is better suited to the pursuit of a unifying theme or vision, but only from a single perspective. An edited, mul- contributor compilation is typically more comprehensive and, by defi- tion, multi-perspective, but may suffer from a lack of coherence, especially when pursuing a topic as embryonic as transparent electronics. Future books on transparent electronics will likely be written utilizing both f- mats. This book is a monograph. Its defining theme is that transparent el- tronics development should be application-driven and, therefore, needs to be undertaken concurrently at the materials, process, device, circuit, and system levels. In support of this theme, background and overview inf- mation is provided in Chapters 1-2; applications are considered in Chapter 3; materials, devices, and circuits are explored in Chapters 4-6; and a p- liminary roadmap for continued development is offered in Chapter 7. As we go to press with this monograph, two final thoughts occur.