ABSTRACT
This chapter discusses measurement validity. An evaluation's data sources or measures include surveys, achievement tests, observations, database or record reviews, and interviews. Reliable and valid measures are the foundation of unbiased evaluation information. A reliable measure is consistent in its findings, and a valid one is accurate. The chapter also explains how to develop reliable and valid new measures, select appropriate measures among those that are currently available, and create a measurement chart to establish logical connections among the evaluation's questions and hypotheses, design, and measures.
