IN PREFAB GREEN, architect Michelle Kaufmann shares her vision of creating thoughtful, sustainable design for everyone. Her firm, Michelle Kaufmann Designs, blends sustainable home layouts, eco-friendly materials, and low-energy options to create a "prepackaged" green solution to home design. Kaufmann tells about five eco-principles that are present in every design her firm creates-smart design, eco-materials, energy efficiency, water conservation, and healthy environment-and how each work together to create homes that make a difference.