The national Core Knowledge and Competencies (CKC) establish agreement across programs and funding streams about what professionals need to know and be able to do in a quality program. The CKCs were developed through a crosswalk of existing CKCs from states or independent organizations and then piloted. There are ten core knowledge areas, which each have a rationale, supporting evidence and indicators for five levels of proficiency. NAA has also developed a set of companion self-assessment tools and a guide (https://naaweb.org/resources/sel-to-the-core) on practices that support effective social-emotional learning in Out-of-School Time.