The Water Resources Council's Principles for Planning Water and Land Resources and Standards for Planning Water and Land Resources require multiple objective planning and evaluation of natural resource use. Within that framework, a regional development account must be prepared for each alternative plan considered in the plan evaluation process. This report examines the uses and limitations of input-output (I-O) analysis in the formulation of the regional development account. The information needs of planners and economists evaluating plans in terms of regional development are identified and I-O's capability to provide some of these data is examined. An application section demonstrates the correct procedures for using regional input-output techniques in the estimation of secondary market impacts of plans, and identifies the limitations of using multipliers in isolation from the I-O model. The report emphasizes evaluating the feasibility of resource plans for a regional economy, as opposed to project justification.