In the last two and half decades, much has been learned about conceptualizing and developing measures for use by practitioners designed to inform their intervention decision making, such as when a child would benefit from receiving additional instructional support (universal screening) and whether the child is responding positively to the intervention when delivered (progress monitoring). The authors describe these developments, related issues continuing to face the field, and what is needed in terms of measures, access, and usability in future practice, research, and development. (Contains 1 figure.)