Research into early childhood transitions has become a field in its own right. It is increasingly understood that a positive start in any new setting can influence the child’s engagement, sense of belonging, well-being, progression in learning, and agency, and may be dependent on the insight of educators and families, and yet there is no research methodology or research methods book dedicated to this growing field of study. Including 27 chapters written by researchers from the UK, New Zealand, the USA, Sweden, Iceland, Australia and Canada this handbook presents an overview of the field exploring its current debates, reflects on its history, and offers suggestions for the future of the field. This book is an essential reference point for anyone studying or undertaking research into transitions in early childhood.