This lecture focuses on environmental attitudes, people’s tendencies to respond favorably or unfavorably to their surroundings through their emotions, beliefs, and behavior—and environmental assessment, or the systematic evaluation of people’s reactions to their present surroundings as well as their preferences about the shape of future environments. The lecture opens with several examples of how music is used to express evaluative sentiments about particular places and more general environmental features such as wilderness and nature. Also, examples of how environmental assessments can be used to bridge the communications gap between land developers, facilities designers, and the eventual occupants or users of particular settings is highlighted. Two phases of environmental assessment, pre-design and post-occupancy evaluation (PDE and POE), are illustrated with examples of environmental simulation techniques, behavioral mapping, analyses of physical traces, and diagnostic walk-throughs of existing environments to assess users’ reactions to them.