It is important to note that while feedback is a central element of control, feed-back as a phenomenon is ubiquitous in science and nature. Homeostasis in biologicalsystems maintains thermal, chemical, and biological conditions through feedback.Global climate dynamics depend on the feedback interactions between the atmo-sphere, oceans, land, and the sun. Ecologies are filled with examples of feedback,resulting in complex interactions between animal and plant life. The dynamics ofeconomies are based on the feedback between individuals and corporations throughmarkets and the exchange of goods and services.While ideas and tools from control can be applied to these systems, we focusour attention in this report on the application of feedback to engineering systems.We also limit ourselves to a small subset of the many aspects of control, choosingto focus on those that are undergoing the most change and are most in need of newideas and techniques.