The focus of this report is on the impact of the working conditions and continuous professional development (CPD) of the workforce in the field of early childhood education and care (ECEC) on the quality of the services provided and, in particular, on the outcomes for children. The report reviews research evidence from all 28 EU Member States, including both English and non-English language studies. The aim is to identify how the training and development of ECEC workers who operate in a range of settings might be tailored to most effectively improve the quality of the care and education services available for children below primary-school age in EU Member States. (author abstract)