The National Environmental Policy Act (NEPA) regulations provide surprisingly little direction for preparing environmental assessments (EA). This book addresses this problem by providing a step-by-step guide for preparing EAs. Bridging the regulatory gap, it draws on information scattered throughout NEPA regulations and guidance documents, as well as best professional practices (BPP) and case law. The book progresses from the fundamentals to successfully more advanced topics, making it suitable for beginners, students, and experienced practitioners alike. It provides an indispensable guide for managing, analyzing, and writing legally defensible EAs.