The use of exclusionary discipline (ExD) – defined as discipline that removes a student from the school setting via expulsion or suspension –has been found to undermine students’ health, well-being, and educational achievement. With the support of a new federal grant, members of the Preschool Exclusionary Discipline Study (PEDS) team will be examining and mapping the prevalence, disparities, and factors associated with the use of ExD in U.S. public school pre-K programs. As we work to accomplish our goals, we plan to disseminate many of our findings through these Research Briefs. (author abstract)