Marleen J. Janssen is a Professor Emeritus of Educational Psychology, in the research unit for Inclusive and Special Needs Education at the University of Groningen in the Netherlands. Her interests include communication development and learning in people with deafblindness. Her research is focused on communication assessment and intervention studies with people who are congenitally deafblind. Previously she was Editor-in-Chief of the Journal of Deafblind Studies on Communication, and Curriculum Coordinator of the MSc program in Pedagogical Sciences Communication and Deafblindness. She founded the University of Groningen Institute for Deafblindness and continues research and writing. Marleen was appointed Knight of the Order of the Netherlands Lion in 2019 and awarded the Deafblind International Lifetime Achievement Award in 2023.Timothy S. Hartshorne is a Professor Emeritus of Psychology, specialized in school psychology, at Central Michigan University. His interests include understanding the challenging behavior exhibited by many individuals with CHARGE syndrome, a rare genetic disorder, and how severe disability impacts the family. Prior to his retirement he was the grant holder for Deafblind Central, Michigan's deafblind project. He has been awarded a Star in CHARGE by the CHARGE Syndrome Foundation. He is first editor of the book CHARGE Syndrome, Second Edition. He holds a Diplomate in Adlerian Psychology from the North American Society of Adlerian Psychology.Walter Wittich is an Associate Professor at the School of Optometry, University of Montreal, in Canada. His research focuses on the rehabilitation of older adults with combined vision and hearing loss. His research domains include basic sensory science, as well as medical, psychosocial, and rehabilitation approaches to sensory loss. He is the inaugural chair of the Deafblind International Research Network, the 2020 recipient of the Canadian Helen Keller Centre 10th Annual JT Award, is a Fellow of both the American Academy of Optometry, and the Association for Research in Vision and Ophthalmology, and is Quebec's first Certified Low Vision Therapist.

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• Marleen J. Janssen, Timothy S. Hartshorne, and Walter Wittich: Introduction Section 1. Identification and Genetics of Deafblindness 1: Saskia Damen, Jesper Dammeyer, and John Ravenscroft: Identification Practices of Children and Adults with Deafblindness in the Netherlands, Denmark, and Scotland 2: Kim D. Blake and Angela Arra: Identification of CHARGE Syndrome 3: Audrey L. Widner and Donna M. Martin: Genetics of Deafblindness Section 2. Assessment 4: Susan M. Bruce, L. Beth Brady, and Tracy Evans Luiselli: Assessment of Communication in Learners who are Deafblind 5: Marleen J. Janssen, Catherine Nelson, Saskia Damen, and Trees van Nunen: The van Dijk Approach of Child Guided Strategies for Assessment and Intervention 6: Erika Pranger-Boers: Dynamic Assessment 7: Charity Rowland, Emily D. Quinn, Alexandria Cook, and Deirdre Galvin-McLaughlin: Using the Communication Matrix to Evaluate and Facilitate Expressive Communication in Children who are Deafblind Section 3. Social Interaction and Behavior 8: Marga M.A.W. Martens: Fostering Affective Involvement and Positive Emotions in Individuals with Congenital Deafblindness. An Intervention Model for Training Communication Partners 9: Timothy S. Hartshorne: Challenging Behavior in CHARGE Syndrome 10: Catherine Nelson and Sarah Ivy: The Relationship between Stress and Challenging Behavior in Children who are Deafblind 11: Kitty A. Bloeming-Wolbrink: An Intervention Program on Interaction and Bodily Emotional Traces 12: Meredith Prain: Let's Connect: Social Interaction, Research, and Support of Adults with Congenital Deafblindness Section 4. Communication, Development, and Interventions 13: Deborah Chen: Young Children who are Deafblind: Implications for Practitioners 14: Andrea Wanka: Communication Development in Children with CHARGE Syndrome 15: Marleen J. Janssen, Saskia Damen, and Kirsten Wolthuis: Interventions to Improve the Quality and Development of Intersubjective Communication 16: Susan M. Bruce: Colby's Growth to Language and Literacy: a Longitudinal Case Study of a Young Man who is Congenitally Deafblind 17: L. Beth Brady: Measuring Multimodal Classroom Environments of Deafblind Learners 18: Chiara Filippini, Patrizia Ceccarani, Pawlos Kassu Abebe, Akhil Paul, Uttam Kumar, Atul Jaiswal, Hiroyuki Sugai, Yoshimi Tsuchiya, and Yi-Tun Tseng: International Perspectives and Local Communication Contexts in Italy, Ethiopia, India, Japan, and Taiwan Section 5. Dialogical Approaches to Communication 19: Anne V. Nafstad, Marlene Daelman, Inger Rødbroe, Ingrid Axelhed, Sanne Brink, Pia Haugaard, Sofi Malmgren, and Håkon Lie: Communicative Relations and the Authentic Communication of Persons with Congenital Deafblindness 20: Marlene Daelman, Paul G. Hart, Marleen J. Janssen, Anne V. Nafstad, Ivana Markova, and Jacques Souriau: Dialogical Dimensions in Communication 21: Anstein Gregersen and Anne V. Nafstad: Multiparty Conversations, Mutual Recognition and Congenital Deafblindness 22: Håkon Lie: Improvisation and Communicative Agency: Contribution of an Improvisational Model to the Analysis of Communicative Agency of a Person with Congenital Deafblindness Section 6. Tactile Communication and Language 23: Lisa van der Mark: Protactile in Europe: The Experiences of Deafblind Signers in Cross-Linguistic Settings, Including a Protactile Training 24: Saskia Damen and Marianne Rorije: Supporting the Communicative Agency of Individuals with Congenital Deafblindness in the Tactile Modality 25: Jesper Dammeyer and Madeleine Chapman: Tactile Language Development in Children with Congenital Deafblindness: Possibilities and Impossibilities 26: Riitta Lahtinen and Russ Palmer: The Application of Social-Haptic Communication: Haptices and Haptemes with Acquired and Congenitally Deafblind People 27: Shimako Iwasaki, Meredith Bartlett, Howard Manns, and Louisa Willoughby: Sensorial Participation and Recipient Actions in Deafblind Signed Interactions 28: Eli Raanes: The Differences Between Sign Language Interpreting and Tactile Sign Language Interpreting 29: Johanna Mesch, Sílvia Gabarró-López, and Eli Raanes: The Use of Sign Space by Deafblind Signers

Marleen J. Janssen is a Professor Emeritus of Educational Psychology, in the research unit for Inclusive and Special Needs Education at the University of Groningen in the Netherlands. Her interests include communication development and learning in people with deafblindness. Her research is focused on communication assessment and intervention studies with people who are congenitally deafblind. Previously she was Editor-in-Chief of the Journal of Deafblind Studies on Communication, and Curriculum Coordinator of the MSc program in Pedagogical Sciences Communication and Deafblindness. She founded the University of Groningen Institute for Deafblindness and continues research and writing. Marleen was appointed Knight of the Order of the Netherlands Lion in 2019 and awarded the Deafblind International Lifetime Achievement Award in 2023.Timothy S. Hartshorne is a Professor Emeritus of Psychology, specialized in school psychology, at Central Michigan University. His interests include understanding the challenging behavior exhibited by many individuals with CHARGE syndrome, a rare genetic disorder, and how severe disability impacts the family. Prior to his retirement he was the grant holder for Deafblind Central, Michigan's deafblind project. He has been awarded a Star in CHARGE by the CHARGE Syndrome Foundation. He is first editor of the book CHARGE Syndrome, Second Edition. He holds a Diplomate in Adlerian Psychology from the North American Society of Adlerian Psychology.Walter Wittich is an Associate Professor at the School of Optometry, University of Montreal, in Canada. His research focuses on the rehabilitation of older adults with combined vision and hearing loss. His research domains include basic sensory science, as well as medical, psychosocial, and rehabilitation approaches to sensory loss. He is the inaugural chair of the Deafblind International Research Network, the 2020 recipient of the Canadian Helen Keller Centre 10th Annual JT Award, is a Fellow of both the American Academy of Optometry, and the Association for Research in Vision and Ophthalmology, and is Quebec's first Certified Low Vision Therapist.

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• Marleen J. Janssen, Timothy S. Hartshorne, and Walter Wittich: Introduction Section 1. Identification and Genetics of Deafblindness 1: Saskia Damen, Jesper Dammeyer, and John Ravenscroft: Identification Practices of Children and Adults with Deafblindness in the Netherlands, Denmark, and Scotland 2: Kim D. Blake and Angela Arra: Identification of CHARGE Syndrome 3: Audrey L. Widner and Donna M. Martin: Genetics of Deafblindness Section 2. Assessment 4: Susan M. Bruce, L. Beth Brady, and Tracy Evans Luiselli: Assessment of Communication in Learners who are Deafblind 5: Marleen J. Janssen, Catherine Nelson, Saskia Damen, and Trees van Nunen: The van Dijk Approach of Child Guided Strategies for Assessment and Intervention 6: Erika Pranger-Boers: Dynamic Assessment 7: Charity Rowland, Emily D. Quinn, Alexandria Cook, and Deirdre Galvin-McLaughlin: Using the Communication Matrix to Evaluate and Facilitate Expressive Communication in Children who are Deafblind Section 3. Social Interaction and Behavior 8: Marga M.A.W. Martens: Fostering Affective Involvement and Positive Emotions in Individuals with Congenital Deafblindness. An Intervention Model for Training Communication Partners 9: Timothy S. Hartshorne: Challenging Behavior in CHARGE Syndrome 10: Catherine Nelson and Sarah Ivy: The Relationship between Stress and Challenging Behavior in Children who are Deafblind 11: Kitty A. Bloeming-Wolbrink: An Intervention Program on Interaction and Bodily Emotional Traces 12: Meredith Prain: Let's Connect: Social Interaction, Research, and Support of Adults with Congenital Deafblindness Section 4. Communication, Development, and Interventions 13: Deborah Chen: Young Children who are Deafblind: Implications for Practitioners 14: Andrea Wanka: Communication Development in Children with CHARGE Syndrome 15: Marleen J. Janssen, Saskia Damen, and Kirsten Wolthuis: Interventions to Improve the Quality and Development of Intersubjective Communication 16: Susan M. Bruce: Colby's Growth to Language and Literacy: a Longitudinal Case Study of a Young Man who is Congenitally Deafblind 17: L. Beth Brady: Measuring Multimodal Classroom Environments of Deafblind Learners 18: Chiara Filippini, Patrizia Ceccarani, Pawlos Kassu Abebe, Akhil Paul, Uttam Kumar, Atul Jaiswal, Hiroyuki Sugai, Yoshimi Tsuchiya, and Yi-Tun Tseng: International Perspectives and Local Communication Contexts in Italy, Ethiopia, India, Japan, and Taiwan Section 5. Dialogical Approaches to Communication 19: Anne V. Nafstad, Marlene Daelman, Inger Rødbroe, Ingrid Axelhed, Sanne Brink, Pia Haugaard, Sofi Malmgren, and Håkon Lie: Communicative Relations and the Authentic Communication of Persons with Congenital Deafblindness 20: Marlene Daelman, Paul G. Hart, Marleen J. Janssen, Anne V. Nafstad, Ivana Markova, and Jacques Souriau: Dialogical Dimensions in Communication 21: Anstein Gregersen and Anne V. Nafstad: Multiparty Conversations, Mutual Recognition and Congenital Deafblindness 22: Håkon Lie: Improvisation and Communicative Agency: Contribution of an Improvisational Model to the Analysis of Communicative Agency of a Person with Congenital Deafblindness Section 6. Tactile Communication and Language 23: Lisa van der Mark: Protactile in Europe: The Experiences of Deafblind Signers in Cross-Linguistic Settings, Including a Protactile Training 24: Saskia Damen and Marianne Rorije: Supporting the Communicative Agency of Individuals with Congenital Deafblindness in the Tactile Modality 25: Jesper Dammeyer and Madeleine Chapman: Tactile Language Development in Children with Congenital Deafblindness: Possibilities and Impossibilities 26: Riitta Lahtinen and Russ Palmer: The Application of Social-Haptic Communication: Haptices and Haptemes with Acquired and Congenitally Deafblind People 27: Shimako Iwasaki, Meredith Bartlett, Howard Manns, and Louisa Willoughby: Sensorial Participation and Recipient Actions in Deafblind Signed Interactions 28: Eli Raanes: The Differences Between Sign Language Interpreting and Tactile Sign Language Interpreting 29: Johanna Mesch, Sílvia Gabarró-López, and Eli Raanes: The Use of Sign Space by Deafblind Signers

Marleen J. Janssen is a Professor Emeritus of Educational Psychology, in the research unit for Inclusive and Special Needs Education at the University of Groningen in the Netherlands. Her interests include communication development and learning in people with deafblindness. Her research is focused on communication assessment and intervention studies with people who are congenitally deafblind. Previously she was Editor-in-Chief of the Journal of Deafblind Studies on Communication, and Curriculum Coordinator of the MSc program in Pedagogical Sciences Communication and Deafblindness. She founded the University of Groningen Institute for Deafblindness and continues research and writing. Marleen was appointed Knight of the Order of the Netherlands Lion in 2019 and awarded the Deafblind International Lifetime Achievement Award in 2023.Timothy S. Hartshorne is a Professor Emeritus of Psychology, specialized in school psychology, at Central Michigan University. His interests include understanding the challenging behavior exhibited by many individuals with CHARGE syndrome, a rare genetic disorder, and how severe disability impacts the family. Prior to his retirement he was the grant holder for Deafblind Central, Michigan's deafblind project. He has been awarded a Star in CHARGE by the CHARGE Syndrome Foundation. He is first editor of the book CHARGE Syndrome, Second Edition. He holds a Diplomate in Adlerian Psychology from the North American Society of Adlerian Psychology.Walter Wittich is an Associate Professor at the School of Optometry, University of Montreal, in Canada. His research focuses on the rehabilitation of older adults with combined vision and hearing loss. His research domains include basic sensory science, as well as medical, psychosocial, and rehabilitation approaches to sensory loss. He is the inaugural chair of the Deafblind International Research Network, the 2020 recipient of the Canadian Helen Keller Centre 10th Annual JT Award, is a Fellow of both the American Academy of Optometry, and the Association for Research in Vision and Ophthalmology, and is Quebec's first Certified Low Vision Therapist.

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• Marleen J. Janssen, Timothy S. Hartshorne, and Walter Wittich: Introduction Section 1. Identification and Genetics of Deafblindness 1: Saskia Damen, Jesper Dammeyer, and John Ravenscroft: Identification Practices of Children and Adults with Deafblindness in the Netherlands, Denmark, and Scotland 2: Kim D. Blake and Angela Arra: Identification of CHARGE Syndrome 3: Audrey L. Widner and Donna M. Martin: Genetics of Deafblindness Section 2. Assessment 4: Susan M. Bruce, L. Beth Brady, and Tracy Evans Luiselli: Assessment of Communication in Learners who are Deafblind 5: Marleen J. Janssen, Catherine Nelson, Saskia Damen, and Trees van Nunen: The van Dijk Approach of Child Guided Strategies for Assessment and Intervention 6: Erika Pranger-Boers: Dynamic Assessment 7: Charity Rowland, Emily D. Quinn, Alexandria Cook, and Deirdre Galvin-McLaughlin: Using the Communication Matrix to Evaluate and Facilitate Expressive Communication in Children who are Deafblind Section 3. Social Interaction and Behavior 8: Marga M.A.W. Martens: Fostering Affective Involvement and Positive Emotions in Individuals with Congenital Deafblindness. An Intervention Model for Training Communication Partners 9: Timothy S. Hartshorne: Challenging Behavior in CHARGE Syndrome 10: Catherine Nelson and Sarah Ivy: The Relationship between Stress and Challenging Behavior in Children who are Deafblind 11: Kitty A. Bloeming-Wolbrink: An Intervention Program on Interaction and Bodily Emotional Traces 12: Meredith Prain: Let's Connect: Social Interaction, Research, and Support of Adults with Congenital Deafblindness Section 4. Communication, Development, and Interventions 13: Deborah Chen: Young Children who are Deafblind: Implications for Practitioners 14: Andrea Wanka: Communication Development in Children with CHARGE Syndrome 15: Marleen J. Janssen, Saskia Damen, and Kirsten Wolthuis: Interventions to Improve the Quality and Development of Intersubjective Communication 16: Susan M. Bruce: Colby's Growth to Language and Literacy: a Longitudinal Case Study of a Young Man who is Congenitally Deafblind 17: L. Beth Brady: Measuring Multimodal Classroom Environments of Deafblind Learners 18: Chiara Filippini, Patrizia Ceccarani, Pawlos Kassu Abebe, Akhil Paul, Uttam Kumar, Atul Jaiswal, Hiroyuki Sugai, Yoshimi Tsuchiya, and Yi-Tun Tseng: International Perspectives and Local Communication Contexts in Italy, Ethiopia, India, Japan, and Taiwan Section 5. Dialogical Approaches to Communication 19: Anne V. Nafstad, Marlene Daelman, Inger Rødbroe, Ingrid Axelhed, Sanne Brink, Pia Haugaard, Sofi Malmgren, and Håkon Lie: Communicative Relations and the Authentic Communication of Persons with Congenital Deafblindness 20: Marlene Daelman, Paul G. Hart, Marleen J. Janssen, Anne V. Nafstad, Ivana Markova, and Jacques Souriau: Dialogical Dimensions in Communication 21: Anstein Gregersen and Anne V. Nafstad: Multiparty Conversations, Mutual Recognition and Congenital Deafblindness 22: Håkon Lie: Improvisation and Communicative Agency: Contribution of an Improvisational Model to the Analysis of Communicative Agency of a Person with Congenital Deafblindness Section 6. Tactile Communication and Language 23: Lisa van der Mark: Protactile in Europe: The Experiences of Deafblind Signers in Cross-Linguistic Settings, Including a Protactile Training 24: Saskia Damen and Marianne Rorije: Supporting the Communicative Agency of Individuals with Congenital Deafblindness in the Tactile Modality 25: Jesper Dammeyer and Madeleine Chapman: Tactile Language Development in Children with Congenital Deafblindness: Possibilities and Impossibilities 26: Riitta Lahtinen and Russ Palmer: The Application of Social-Haptic Communication: Haptices and Haptemes with Acquired and Congenitally Deafblind People 27: Shimako Iwasaki, Meredith Bartlett, Howard Manns, and Louisa Willoughby: Sensorial Participation and Recipient Actions in Deafblind Signed Interactions 28: Eli Raanes: The Differences Between Sign Language Interpreting and Tactile Sign Language Interpreting 29: Johanna Mesch, Sílvia Gabarró-López, and Eli Raanes: The Use of Sign Space by Deafblind Signers