The second volume of the handbook starts with perspectives on human-agent interaction, examined from different angles such as interaction in social space, group interaction, or long-term interaction. It continues with an extensive overview summarizing research and systems of human–agent platforms, alongside with some of the major application areas of socially interactive agents such as education, aging support, autism and games, highlighting the benefits of SIAs to individuals and society. It concludes with a challenge discussion containing an interview with international experts of their field, discussing the major challenges SIA research is facing today, and pointing out potential future directions.

A digital version of volume 2 of the book can be purchased in the ACM digital library: https://dl.acm.org/doi/book/10.1145/3563659
The printed version can be purchased in  in different online bookstores, e.g. Amazon.
We are grateful to ACM for allowing us to share the preprints of the chapters.

Foreword
Ruth Aylett

Preface
Birgit Lugrin

Chapter 14  Interaction in Social Space  | 3

Hannes Högni Vilhjálmsson

Chapter 15 Dialogue for Socially Interactive Agents | 45
David Traum

Chapter 16 The Fabric of Socially Interactive Agents — Multimodal Interaction Architectures | 77
Stefan Kopp and Teena Hassan

Chapter 17 Multiparty Interaction Between Humans and Socially Interactive Agents | 113
Sarah Gillet, Marynel Vázquez, Christopher Peters, Fangkai Yang and Iolanda Leite

Chapter 18 Adaptive Artificial Personalities | 155
Kathrin Janowski Hannes Ritschel and Elisabeth André

Chapter 19 Long-term Interaction with Relational Socially Interactive Agents | 195
Jacqueline M. Kory-Westlund, Cynthia Breazeal, Hae Won Park and Ishaan Grover

Chapter 20 Platforms and Tools for Socially Interactive Agent Research and Development | 261
Arno Hartholt and Sharon Mozgai

Chapter 21 Pegagogical Agents | 307

H. Chad Lane and Noah L. Schroeder

Chapter 22 Socially Interactive Agents as Peers | 331
Justine Cassell

Chapter 23 Socially Interactive Agents for Supporting Aging | 367
Moojan Ghafurian, John Edison Munoz Cardona, Jennifer Boger, Jesse Hoey and Kerstin Dautenhahn

Chapter 24 Health-Related Applications of Socially Interactive Agents | 403
Timothy Bickmore

Chapter 25 Autism and Socially Interactive Agents | 437
Jacqueline Nadel, Ouriel Grynszpan and Jean-Claude Martin

Chapter 26 Interactive Narrative and Story-telling | 463
Ruth Aylett

Chapter 27 Socially Interactive Agents in Games | 493
Rui Prada and Diogo Rato

Chapter 28 Serious Games with Socially Interactive Agents | 527
Patrick Gebhard, Dimitra Tzovaltzi, Tanja Schneeberger and Fabrizio Nunnari

Birgit Lugrin, Catherine Pelachaud, Elisabeth André, Ruth Aylett, Timothy Bickmore, Cynthia Breazeal, Joost Broekens, Kerstin Dautenhahn, Jonathan Gratch, Stefan Kopp, Jacqueline Nadel, Ana Paiva and Agnieszka Wykowska