Since its 1947 founding, ETS has conducted and disseminated scientific research to support its products and services, and to advance the measurement and education fields. In keeping with these goals, ETS is committed to making its research freely available to the professional community and to the general public. Published accounts of ETS research, including papers in the ETS Research Report series, undergo a formal peer-review process by ETS staff to ensure that they meet established scientific and professional standards. All such ETS-conducted peer reviews are in addition to any reviews that outside organizations may provide as part of their own publication processes. Performance moderators are characteristics of students that impact reading performance but are not considered a part of the reading construct. These include (a) background and prior knowledge, (b) metacognitive and self-regulatory strategies and behavior, (c) reading strategies, and (d) student motivation and engagement. In this paper, we argue there is added value in incorporating performance moderators into a reading test design. We characterize added value with respect to the validity of the claims derived from test scores, the interpretation of the test scores, and the relevance to instruction. As a second aim, we present a case for using scenariobased assessments and how they can be used to integrate into the test design both the performance moderators as well as other features that make the assessment more instructionally relevant.