In the HCD Measurement Guides, you'll learn how to implement measurement strategies using "compiled indicators"-a ontologically-based system of measuring complex, multidimensional outcomes like human-centered design projects. This approach allows measurement of indirectly measurable situations without requiring control over all variables, uses accessible computational methods rather than sophisticated statistical modeling, and has been validated by major institutions including USAID, OECD, and the European Union's Eurostat. The Concepts portion explains the "why" behind this measurement methodology and works in tandem with the companion Operations guide that details the "how" of identifying indicators, scoring them, and compiling scores to understand both the overall value of offerings and how they should evolve based on evidence.