Basic measurements and applications of six selected general but critical operational performance-based indicators--effectiveness, efficiency, productivity, profitability, return on investment, and benefit-cost ratio--are presented. With each measurement, goals and potential impact are explored. Errors, risks, limitations to measurements, and a final check for validity, applicability, accountability, and usability of these measurements are discussed. This article provides a simple, practical guide to performance measurement for organizations and human performance technology practitioners' accountability and continuous improvement. (Contains 2 tables, 1 figure, and 1 exhibit.)