Pentti Haddington is Professor of English language and interaction at the University of Oulu, Finland. Tiina Eilittä is a doctoral researcher at the University of Oulu, Finland.Antti Kamunen is a postdoctoral researcher at the University of Oulu, Finland.Laura Kohonen-Aho is a postdoctoral researcher at the University of Oulu, Finland.Iira Rautiainen is a postdoctoral researcher at the University of Oulu, Finland.Anna Vatanen is a researcher at the University of Helsinki, Finland, and also affiliated with the University of Oulu, Finland.The editors form a team that has worked together on complexity of interaction for several years in the projects iTask: Linguistic and embodied features of interactional multitasking and PeaceTalk: Talk and interaction in multinational crisis management training funded by the Academy of Finland and Eudaimonia Institute at the University of Oulu, Finland.

• Chapter 1. On the complexities of interaction: An introduction (Tiina Eilittä, Pentti Haddington, Antti Kamunen, Laura Kohonen-Aho, Iira Rautiainen and Anna Vatanen).- Part I: Complexity that resides in multiactivity multisensoriality.- Chapter 2. Tasting vs. eating: The methodic and situated differentiation of embodied multisensorial activities in social interaction (Lorenza Mondada).- Chapter 3. Metagaming and multiactivity: How board gamer players deal with progressivity (Emily Hofstetter and Jessica Robles).- Chapter 4. Embodied noticings as repair initiations: On multiactivity in choir rehearsals (Anna Vatanen).- Part II: Complexity that resides in asymmetries related to affordances, resources and roles.- Chapter 5. Intersubjective interaction during the word explanation activity in social virtual reality (Heidi Spets).- Chapter 6. Building on linguistically exclusive talk: Access, participation and progressivity in a multinational military staff (Antti Kamunen and Pentti Haddington).- Chapter 7. Nudging questions as devices for prompting courses of action and negotiating deontic (a)symmetry in UN Military Observer training (Iira Rautiainen, Pentti Haddington and Antti Kamunen).- Part III: Complexity that resides in the coordination of participation frameworks.- Chapter 8. Playing together on a large screen: Spatiality, materiality, temporality and the complexity of interaction (Heike Baldauf-Quilliatre and Biagio Ursi).- Chapter 9. Getting (others) involved with smartphones: Participation in showing sequences in multi-party settings (Iuliia Avgustis and Florence Oloff).- Chapter 10. The primacy of affective engagement in simultaneously unfolding participation frameworks (Julia Katila, Yumei Gan, Sara Goico and Marjorie Goodwin).- Part IV: Complexity that resides in the characteristics of interactional settings and environments.- Chapter 11. Ambulatory openings (Elliot M. Hoey).- Chapter 12. Openings of interactions in immersive virtual reality: Identifyingand recognising prospective co-participants (Pentti Haddington, Laura Kohonen-Aho, Sylvaine Tuncer and Heidi Spets).- Chapter 13. Transitions between interactional spaces: Working towards shared understanding in a hybrid workshop setting (Laura Kohonen-Aho).