For the first time in a single source, here are all the key legislation, terminology, and documents–plus invaluable guidance through an array of potential impact study areas. Includes important information on data needs and sources, agency contacts, laws and permits, methodologies, presentation of results, and other practical issues. Provides numerous examples and a host of useful suggestions throughout, while skillfully interweaving an attention to basic requirements with an understanding of the principles underlying impact investigation. There is also an extensive index, affording instant access to an topic..