A detailed methodology has been developed which determines the accuracy with which planning and environmental review documents (NEPA documents) assessed predicted environmental effects of Construction Grants projects. The methodology was developed to evaluate the entire spectrum of Construction Grants projects. In general, evaluations are possible for three types of situations: single project; aggregate of projects; and an entire program. Specific components of the methodology include the use of: (1) a simple set of procedures; (2) a standard set of issues for evaluations; (3) systematic data retrieval; (4) uniform measurements; and (5) consistent documentation. Use of the manual will necessitate a combination of structured analysis with qualified professional judgment; judgment that assumes a degree of experience in impact assessment. Documentation of judgmental decisions is required within the methodology to insure an understanding of the subjective factors influencing the evaluations.