Goal setting and attainment is often a targeted outcome in the intellectual and developmental disabilities field; however, standardizing the measurement of attainment of individualized goals is challenging. The purpose of this article is to introduce a four-domain framework that provides a series of questions to research and evaluation teams in planning for the use of goal attainment scaling (GAS) as an outcome measure at the individual or aggregate level. We intend to stimulate discussion and ongoing work to further systematize how GAS is used in (a) intervention research to establish evidence-based practices and (b) practice to assess the extent to which interventions and supports lead to intended outcomes. The goal is to promote a clear planning process to inform data collection on individualized goal attainment outcomes that are rooted in goals and outcomes valued by people with intellectual and developmental disabilities.