ECEC is a topic of increased policy interest in Finland where improving quality in the ECEC sector is a subject of growing importance. One of the aspects that matters most for the level of quality of ECEC provision is the adults who work with young children in preschool education, i.e., the ECEC workforce. Well-educated, well-trained professionals are the key factor in providing high-quality ECEC with the most favourable cognitive and social outcomes for children.