Foreword [Trish Greenhalgh] -- Prologue [Per Nilsen, Sarah A. Birken] -- Part I: Theoretical approaches in implementation science -- 1. Overview of theories, models and frameworks in implementation science [per Nilsen] -- 2. Exploration, preparation, implementation, sustainment (epis) framework [Joanna C. Moullin, Kelsey S. Dickson, Nicole A. Stadnick, Jennifer Edwards Becan, Tisha Wiley, Joella Phillips, Melissa Hatch, Gregory A. Aarons] 3. Active implementation frameworks [Dean L. Fixsen, Karen A. Blase] -- 4. The consolidated framework for implementation research (CFIR) [Laura J. Damschroder, Caitlin M. Reardon, Julie C. Lowery] -- 5. Promoting action on research implementation in health services - the integrated-parihs framework (i-parihs) [Gillian Harvey, Alison Kitson] -- 6. Normalization process theory [Carl May, Tracy Finch, Tim Rapley] -- 7. The behaviour change wheel approach [Danielle d'Lima, Fabiana Lorencatto, Susan Michie] -- 8. A theory of organizational readiness for change [Bryan J. Weiner] -- Part II: Key concepts in implementation science 9. Strategies [Jennifer Leeman, Per Nilsen] 10. Context [Per Nilsen, Susanne Bernhardsson] 11. Outcomes [Enola K. Proctor] -- 12. Fidelity [Christopher Carroll] -- 13. Adaptation [M. Alexis Kirk] -- 14. Sustainability [Laura Lennox] -- parti iii: Perspectives on implementation science -- 15. Policy implementation research [Per Nilsen, Paul Cairney] -- 16. Improvement science [Per Nilsen, Miriam Bender, Johan Thor, Jennifer Leeman, Boel Andersson Gäre, Nick Sevdalis] 17. Implementation from a learning perspective [Per Nilsen, Margit Neher, Per-erik Ellström, Benjamin Gardner] -- 18. Implementation from a habit perspective [Sebastian Potthoff, Nicola Mccleary, Falko F. Sniehotta, Justin Presseau] -- 19. Organizational perspectives in implementation science [Emily R. Haines, Sarah A. Birken] -- Part IV: Doing implementation science research -- 20. Selecting theoretical approaches [Sarah A. Birken] -- 21. Traditional approaches to conducting implementation research [Soohyun Hwang, Sarah A. Birken, Geoffrey Curran] -- 22. Ethnography [Jeanette Wassar Kirk, Emily R. Haines] 23. Social network analysis [Alicia C. Bunger, Reza Yousefi Nooraie] 24. Configurational comparative methods [Deborah Cragun] 25. Realist evaluation [Ann Catrine Eldh, Kate Seers, Joanne Rycroft-malone] -- 26. Programme theory [Per Nilsen, Henna Hasson] -- 27. Group concept mapping [Thomas J. Waltz] -- Epilogue [Sarah A. Birken, Per Nilsen].