This paper provides Part C and Part B state staff an opportunity to learn about considerations that could support changing their State-Identified Measurable Result (SIMR) baselines or targets. States are required to focus on a particular SIMR. The SIMR must be a child, youth, or family outcome and cannot be a process outcome. The SIMR might be, for example, a measure of school readiness, of achievement, of graduation rates, or of college or career readiness. The measure must include either (a) all children or youth with disabilities in the state or (b) a subset of these children or youth, with an explanation about how improving the result for that subset would improve that result on a statewide basis. Since states will be working on data quality for their SIMR, it is possible that, as data quality improves, the data for baselines will change, which could lead to revising the targets. This paper addresses four central questions: (1) What are baseline data? (2) Why change a SIMR baseline? (3) What is a target? and (4) Why change SIMR targets?