Part I: Introduction.- Chapter 1: Enabling knowledge development relevant for ECEC.- Part II: Example studies.- Chapter 2: A retrospective view on researchers'' and preschool teachers'' collaboration: The case of developing children''s learning in preschool.- Chapter 3: Exploring mixed roles and goals in collaborative research: The example of toddler mathematics education.- Chapter 4: Managing the tension between the known and the unknown in knowledge-building: The example of the Play-Responsive Early Childhood Education and Care (PRECEC).- Chapter 5: Success of and barriers to workshop methodology: Experiences from Exploration and Pedagogical Innovation Laboratories (EX-PED-LAB).- Chapter 6: Opening up new spaces for action: Challenges of participatory action research for preschool practice transformation in an introductory unit for immigrant children.- Chapter 7: Integrating digital technologies in teaching and learning through participation: Case studies from the Xlab - Design, Learning, Innovation laboratory.- Chapter 8: Interprofessional dialogue and the importance of contextualising children''s participation: A collaboration between different disciplines round new technology.- Chapter 9: Mutuality in collaboration: A development project for teaching in multilingual ECEC.- Part III: Theoretical and conceptual discussions and tools.- Chapter 10: The importance of de-reifying language in research with early childhood education and care professionals: A critical feature of workshop methodology.- Chapter 11: Responding to wicked tensions and problems in practices-developing research.- Chapter 12: Terminological and conceptual meta-commentaries on practices-developing research.