Jonathan S. Abramowitz is Professor and Associate Chair of Psychology, at the University of North Carolina at Chapel Hill. He serves as the Director of Anxiety and Stress Disorders Clinic at UNC-Chapel Hill. Dr. Abramowitz has received multiple grants and awards for his research and contributions to the field of OCD and anxiety disorders, and has authored more than 250 articles, book chapters, and books. Dean McKay is Professor in the Department of Psychology, Fordham University and former President of the Association for Behavioral and Cognitive Therapies (ABCT). Dr. McKay has published over 170 articles and book chapters, and edited or co-edited 14 books related to the treatment of complex cases in children and adults, OCD, disgust in psychopathology and research methodology. Eric A. Storch is Professor and All Children's Hospital Guild Endowed Chair in the Departments of Pediatrics, Psychiatry and Behavioral Neurosciences, and Psychology at the University of South Florida. Dr. Storch has published 12 books and over 450 articles and chapters on topics relating to the nature and treatment of childhood and adult OCD, anxiety disorders, and anxiety among youth with autism.

• List of Contributors viiiIntroductionObsessive-Compulsive and Related Disorders: Where Have We Been? 1Dean McKay, Jonathan S. Abramowitz, and Eric A. Storch1 Description and Prevalence of OCD in Children and Adolescents 5Sophie C. James, Lara J. Farrell, and Melanie J. Zimmer]Gembeck2 Diagnostic Description and Prevalence 24Andrew G. Guzick, Adam M. Reid, Amanda M. Balki, Cindi Flores,Anyaliese D. Hancock]Smith, Brian Olsen, Greg Muller, Gary R. Geffken, and Joseph P.H. McNamara3 Description and Prevalence of OCD in the Elderly 44Mary E. Dozier and Catherine R. Ayers4 Cross-Cultural Phenomenology of Obsessive-Compulsive Disorder 56M. T. Williams, L. K. Chapman, J. V. Simms, and G. Tellawi5 Diagnostic Assessment and Measures of Symptom Severity for OCD in Adults 75Kevin D. Wu6 Measures for Diagnosing and Measuring Severity of OCD Symptoms in Children 95Hannah Frank, Elyse Stewart, Jennifer Herren, and Kristen Benito7 Functional Assessment 124Lillian Reuman and Jonathan S. Abramowitz8 Assessment of Cognitive Distortions and Cognitive Biases 138Patrick A. Vogel and Stian Solem9 A Critical Review of Neuropsychological Functioning and Heterogeneity in Individuals with Obsessive-Compulsive Disorder 155Michael J. Larson and Ann Clawson10 An International Perspective on Obsessive-Compulsive Disorder Assessment 176Miquel A. Fullana, Clara López]Sola, Lorena Fernández de la Cruz, and Pino Alonso11 Using Objective Personality Assessment for Effective Treatment Planning 209Caleb W. Lack and Brittany M. Riggin12 Psychological Models and Treatments of OCD for Adults 223Noah C. Berman, Rachel Schwartz, and Jennifer Park13 Psychological Models and Treatments for OCD in Children 244Amy Przeworski and Jennifer M. Birnkrant14 Biological Models and Treatments for OCD in Adults 261S. Evelyn Stewart and Adrian S. Loh15 Neurobiological and Neurodevelopmental Perspectives on OCD and their Clinical Implications 283Tord Ivarsson, Bernhard Weidle, Gudmundur Skarphedinsson, and Robert Valderhaug16 Pharmacological Augmentations of SRIs for Obsessive Compulsive Disorder 311Eric W. Leppink and Jon E. Grant17 Contamination Fear and Avoidance in Adults 341Dean McKay and Sean Carp18 Contamination Concerns in Children and Adolescents 352Robert R. Selles, Elysse A. Arnold, and Eric A. Storch19 Responsibility, Checking, and Reassurance-seeking in OCD 361Rachael L. Neal, Gillian M. Alcolado, and Adam. S. Radomsky20 Harm Avoidance and Checking Rituals in Pediatric Obsessive Compulsive Disorder 377Michelle Rozenman, Allison Vreeland, and Tara S. Peris21 Symmetry, Ordering, and Arranging Symptoms in Adults 395Steven Taylor22 Symmetry and Ordering in Youth with Obsessive Compulsive Disorder 405Amy M. Jacobsen and Ashley J. Smith23 Repugnant Obsessions: Phenomenology, Etiology, and Treatment 421David A. Clark and Catherine A. Hilchey24 Unacceptable Obsessional Thoughts in Children and Adolescents 441Carly Johnco and Eric A. Storch25 Mental Contamination 457Anna E. Coughtrey, Roz Shafran, and Sophie Bennett26 Obsessive-Compulsive Problems in Very Young Children 474Tommy Chou, Mariah DeSerisy, Abbe M. Garcia, Jennifer B. Freeman, and Jonathan S. Comer27 Insight in Obsessive-Compulsive Disorder 492Monica S. Wu and Adam B. Lewin28 Postpartum Obsessive-Compulsive Disorder 511Shannon M. Blakey and Jonathan S. Abramowitz29 Understanding and Treating Scrupulosity 527Jedidiah Siev, Jonathan D. Huppert, and Shelby E. Zuckerman30 Assessment and Treatment of Relationship]Related OCD Symptoms (ROCD): A Modular Approach 547Guy Doron and Danny Derby31 Exposure Therapy 565Shannon M. Blakey, Lillian Reuman, Ryan J. Jacoby, and Jonathan S. Abramowitz32 Cognitive Therapy for Obsessive-Compulsive Disorder 581Morag Yule and Maureen L. Whittal33 Acceptance and Commitment Therapy for OCD 596Brooke M. Smith, Ellen J. Bluett, Eric B. Lee, and Michael P. Twohig34 Family-Based Conceptualization and Treatment of Obsessive-Compulsive Disorder 614Cynthia Turner, Georgina Krebs, and Jessie Destro35 An Interpersonal Perspective on the Conceptualization and Treatment OCD 632Jonathan S. Abramowitz36 Metacognitive Model and Treatment of OCD 644Adrian Wells, Samuel Myers, Michael Simons, and Peter Fisher37 Computer-Aided Interventions for Obsessive-Compulsive Spectrum Disorders 663Erik Andersson, David Mataix]Cols, and Christian Rück38 Neurosurgical Treatments for Obsessive Compulsive Disorder 681Sarah M. Fayad and Herbert E. Ward39 Obsessive Compulsive Disorder and Comorbidity: Rates, Models, and Treatment Approaches 697Neil A. Rector, Jesse Lee Wilde, and Margaret A. Richter40 Obsessive Compulsive Personality Disorder 726Michael G. Wheaton and Anthony Pinto41 Pediatric Acute-onset Neuropsychiatric Syndrome 743Margo Thienemann and Tanya K. Murphy42 Phenomenology of Tourette Syndrome 762Jennifer M. Park, Abigail Stark, and Thilo Deckersbach43 Body Dysmorphic Disorder 774Andrea Sabrina Hartmann and Naomi Lyons44 Phenomenology of Health Anxiety 790John R. Walker and Patricia Furer45 Phenomenology of Excoriation (Skin Picking) Disorder 806Lauren S. Hallion, Esther S. Tung, and Nancy J. Keuthen46 Phenomenology of Trichotillomania 817David C. Houghton and Douglas W. Woods47 Phenomenology of Hoarding Disorder 832Mary E. Dozier and Catherine R. Ayers48 Obsessive-Compulsive and Related Disorders in Ethnoracial Minorities: Attitudes, Stigma, and Barriers to Treatment 847Monnica Williams, Broderick Sawyer, Melissa Ellsworth, Sonia Singh, and Ghazel Tellawi49 Diagnostic and Severity Measures for Adults with Obsessive-Compulsive Related Disorders 873Stephanie Taillefer and Martin M. Antony50 Diagnostic and Severity Measures for Children and Adolescents with Obsessive-Compulsive and Related Disorders 890Joseph F. McGuire, Erin M. Brennan, and Eric A. Storch51 Functional Assessment of Obsessive-Compulsive Related Disorders 912Caroline S. Holman, Brittany Rohl, and Margaret S. Andover52 Assessment of Obsessive-Compulsive Related Disorders from an International Perspective 924Marina Iniesta-Sepúlveda, Ana I. Rosa-Alcázar, and Ángel Rosa-Alcázar53 Psychological Treatment of Tourette Syndrome 941Michael B. Himle and Krishnapriya Ramanujam54 Treatment of Body Dysmorphic Disorder 962Lauren Mancusi, Rachel Ojserkis, and Dean McKay55 Treatment of Health Anxiety 977Steven Taylor and Gordon J. G. Asmundson56 Psychological Treatment of Excoriation Disorder 990Ivar Snorrason, Amy R. Goetz, and Han-Joo Lee57 Psychological Treatment of Trichotillomania 1009Sarah K. Francazio, Yolanda E. Murphy, and Christopher A. Flessner58 Psychological Treatment of Hoarding Disorder 1023Randy O. Frost, Hannah Trumbo, and Rachel Goar59 Biological Models and Treatments for Obsessive-Compulsive Related Disorders for Adults 1039Robert Hudak, Xenia Borue, and Mehak Sharma60 Biological Models and Treatments for Obsessive-Compulsive and Related Disorders for Children and Adolescents 1061Paul Arnold and Sefi Kronenberg61 The Nature and Management of Older Adults’ Obsessive-Compulsive and Obsessive-Compulsive-Related Disorders 1097John E. Calamari, Chelsey M. Wilkes, and Caroline Prouvost62 Sensory Phenomena in Obsessive-Compulsive Related Disorders 1119Maria Conceição do Rosário, Ana Gabriela Hounie, and Ygor Ferrão63 Comorbidity in Obsessive-Compulsive and Related Disorders 1133Ilana Frydman, Paula Vigne, Gabriela M. Ferreira, André Luís Campos-Lima, Leonardo F. Fontenelle, and Gabriela Bezerra de Menezes64 Emotion Regulation in the Obsessive-Compulsive Spectrum Disorders 1152Lisa A. Napolitano65 Acceptance and Commitment Therapy for OC-Spectrum Disorders 1175Kate L. Morrison, Brooke M. Smith, Eric B. Lee, and Michael P. Twohig66 Family-based Conceptualization and Treatment of Obsessive-Compulsive Related Disorders 1193Eli R. Lebowitz and Josh GoltIndex 1208

Jonathan S. Abramowitz is Professor and Associate Chair of Psychology, at the University of North Carolina at Chapel Hill. He serves as the Director of Anxiety and Stress Disorders Clinic at UNC-Chapel Hill. Dr. Abramowitz has received multiple grants and awards for his research and contributions to the field of OCD and anxiety disorders, and has authored more than 250 articles, book chapters, and books. Dean McKay is Professor in the Department of Psychology, Fordham University and former President of the Association for Behavioral and Cognitive Therapies (ABCT). Dr. McKay has published over 170 articles and book chapters, and edited or co-edited 14 books related to the treatment of complex cases in children and adults, OCD, disgust in psychopathology and research methodology. Eric A. Storch is Professor and All Children's Hospital Guild Endowed Chair in the Departments of Pediatrics, Psychiatry and Behavioral Neurosciences, and Psychology at the University of South Florida. Dr. Storch has published 12 books and over 450 articles and chapters on topics relating to the nature and treatment of childhood and adult OCD, anxiety disorders, and anxiety among youth with autism.

• List of Contributors viiiIntroductionObsessive-Compulsive and Related Disorders: Where Have We Been? 1Dean McKay, Jonathan S. Abramowitz, and Eric A. Storch1 Description and Prevalence of OCD in Children and Adolescents 5Sophie C. James, Lara J. Farrell, and Melanie J. Zimmer]Gembeck2 Diagnostic Description and Prevalence 24Andrew G. Guzick, Adam M. Reid, Amanda M. Balki, Cindi Flores,Anyaliese D. Hancock]Smith, Brian Olsen, Greg Muller, Gary R. Geffken, and Joseph P.H. McNamara3 Description and Prevalence of OCD in the Elderly 44Mary E. Dozier and Catherine R. Ayers4 Cross-Cultural Phenomenology of Obsessive-Compulsive Disorder 56M. T. Williams, L. K. Chapman, J. V. Simms, and G. Tellawi5 Diagnostic Assessment and Measures of Symptom Severity for OCD in Adults 75Kevin D. Wu6 Measures for Diagnosing and Measuring Severity of OCD Symptoms in Children 95Hannah Frank, Elyse Stewart, Jennifer Herren, and Kristen Benito7 Functional Assessment 124Lillian Reuman and Jonathan S. Abramowitz8 Assessment of Cognitive Distortions and Cognitive Biases 138Patrick A. Vogel and Stian Solem9 A Critical Review of Neuropsychological Functioning and Heterogeneity in Individuals with Obsessive-Compulsive Disorder 155Michael J. Larson and Ann Clawson10 An International Perspective on Obsessive-Compulsive Disorder Assessment 176Miquel A. Fullana, Clara López]Sola, Lorena Fernández de la Cruz, and Pino Alonso11 Using Objective Personality Assessment for Effective Treatment Planning 209Caleb W. Lack and Brittany M. Riggin12 Psychological Models and Treatments of OCD for Adults 223Noah C. Berman, Rachel Schwartz, and Jennifer Park13 Psychological Models and Treatments for OCD in Children 244Amy Przeworski and Jennifer M. Birnkrant14 Biological Models and Treatments for OCD in Adults 261S. Evelyn Stewart and Adrian S. Loh15 Neurobiological and Neurodevelopmental Perspectives on OCD and their Clinical Implications 283Tord Ivarsson, Bernhard Weidle, Gudmundur Skarphedinsson, and Robert Valderhaug16 Pharmacological Augmentations of SRIs for Obsessive Compulsive Disorder 311Eric W. Leppink and Jon E. Grant17 Contamination Fear and Avoidance in Adults 341Dean McKay and Sean Carp18 Contamination Concerns in Children and Adolescents 352Robert R. Selles, Elysse A. Arnold, and Eric A. Storch19 Responsibility, Checking, and Reassurance-seeking in OCD 361Rachael L. Neal, Gillian M. Alcolado, and Adam. S. Radomsky20 Harm Avoidance and Checking Rituals in Pediatric Obsessive Compulsive Disorder 377Michelle Rozenman, Allison Vreeland, and Tara S. Peris21 Symmetry, Ordering, and Arranging Symptoms in Adults 395Steven Taylor22 Symmetry and Ordering in Youth with Obsessive Compulsive Disorder 405Amy M. Jacobsen and Ashley J. Smith23 Repugnant Obsessions: Phenomenology, Etiology, and Treatment 421David A. Clark and Catherine A. Hilchey24 Unacceptable Obsessional Thoughts in Children and Adolescents 441Carly Johnco and Eric A. Storch25 Mental Contamination 457Anna E. Coughtrey, Roz Shafran, and Sophie Bennett26 Obsessive-Compulsive Problems in Very Young Children 474Tommy Chou, Mariah DeSerisy, Abbe M. Garcia, Jennifer B. Freeman, and Jonathan S. Comer27 Insight in Obsessive-Compulsive Disorder 492Monica S. Wu and Adam B. Lewin28 Postpartum Obsessive-Compulsive Disorder 511Shannon M. Blakey and Jonathan S. Abramowitz29 Understanding and Treating Scrupulosity 527Jedidiah Siev, Jonathan D. Huppert, and Shelby E. Zuckerman30 Assessment and Treatment of Relationship]Related OCD Symptoms (ROCD): A Modular Approach 547Guy Doron and Danny Derby31 Exposure Therapy 565Shannon M. Blakey, Lillian Reuman, Ryan J. Jacoby, and Jonathan S. Abramowitz32 Cognitive Therapy for Obsessive-Compulsive Disorder 581Morag Yule and Maureen L. Whittal33 Acceptance and Commitment Therapy for OCD 596Brooke M. Smith, Ellen J. Bluett, Eric B. Lee, and Michael P. Twohig34 Family-Based Conceptualization and Treatment of Obsessive-Compulsive Disorder 614Cynthia Turner, Georgina Krebs, and Jessie Destro35 An Interpersonal Perspective on the Conceptualization and Treatment OCD 632Jonathan S. Abramowitz36 Metacognitive Model and Treatment of OCD 644Adrian Wells, Samuel Myers, Michael Simons, and Peter Fisher37 Computer-Aided Interventions for Obsessive-Compulsive Spectrum Disorders 663Erik Andersson, David Mataix]Cols, and Christian Rück38 Neurosurgical Treatments for Obsessive Compulsive Disorder 681Sarah M. Fayad and Herbert E. Ward39 Obsessive Compulsive Disorder and Comorbidity: Rates, Models, and Treatment Approaches 697Neil A. Rector, Jesse Lee Wilde, and Margaret A. Richter40 Obsessive Compulsive Personality Disorder 726Michael G. Wheaton and Anthony Pinto41 Pediatric Acute-onset Neuropsychiatric Syndrome 743Margo Thienemann and Tanya K. Murphy42 Phenomenology of Tourette Syndrome 762Jennifer M. Park, Abigail Stark, and Thilo Deckersbach43 Body Dysmorphic Disorder 774Andrea Sabrina Hartmann and Naomi Lyons44 Phenomenology of Health Anxiety 790John R. Walker and Patricia Furer45 Phenomenology of Excoriation (Skin Picking) Disorder 806Lauren S. Hallion, Esther S. Tung, and Nancy J. Keuthen46 Phenomenology of Trichotillomania 817David C. Houghton and Douglas W. Woods47 Phenomenology of Hoarding Disorder 832Mary E. Dozier and Catherine R. Ayers48 Obsessive-Compulsive and Related Disorders in Ethnoracial Minorities: Attitudes, Stigma, and Barriers to Treatment 847Monnica Williams, Broderick Sawyer, Melissa Ellsworth, Sonia Singh, and Ghazel Tellawi49 Diagnostic and Severity Measures for Adults with Obsessive-Compulsive Related Disorders 873Stephanie Taillefer and Martin M. Antony50 Diagnostic and Severity Measures for Children and Adolescents with Obsessive-Compulsive and Related Disorders 890Joseph F. McGuire, Erin M. Brennan, and Eric A. Storch51 Functional Assessment of Obsessive-Compulsive Related Disorders 912Caroline S. Holman, Brittany Rohl, and Margaret S. Andover52 Assessment of Obsessive-Compulsive Related Disorders from an International Perspective 924Marina Iniesta-Sepúlveda, Ana I. Rosa-Alcázar, and Ángel Rosa-Alcázar53 Psychological Treatment of Tourette Syndrome 941Michael B. Himle and Krishnapriya Ramanujam54 Treatment of Body Dysmorphic Disorder 962Lauren Mancusi, Rachel Ojserkis, and Dean McKay55 Treatment of Health Anxiety 977Steven Taylor and Gordon J. G. Asmundson56 Psychological Treatment of Excoriation Disorder 990Ivar Snorrason, Amy R. Goetz, and Han-Joo Lee57 Psychological Treatment of Trichotillomania 1009Sarah K. Francazio, Yolanda E. Murphy, and Christopher A. Flessner58 Psychological Treatment of Hoarding Disorder 1023Randy O. Frost, Hannah Trumbo, and Rachel Goar59 Biological Models and Treatments for Obsessive-Compulsive Related Disorders for Adults 1039Robert Hudak, Xenia Borue, and Mehak Sharma60 Biological Models and Treatments for Obsessive-Compulsive and Related Disorders for Children and Adolescents 1061Paul Arnold and Sefi Kronenberg61 The Nature and Management of Older Adults’ Obsessive-Compulsive and Obsessive-Compulsive-Related Disorders 1097John E. Calamari, Chelsey M. Wilkes, and Caroline Prouvost62 Sensory Phenomena in Obsessive-Compulsive Related Disorders 1119Maria Conceição do Rosário, Ana Gabriela Hounie, and Ygor Ferrão63 Comorbidity in Obsessive-Compulsive and Related Disorders 1133Ilana Frydman, Paula Vigne, Gabriela M. Ferreira, André Luís Campos-Lima, Leonardo F. Fontenelle, and Gabriela Bezerra de Menezes64 Emotion Regulation in the Obsessive-Compulsive Spectrum Disorders 1152Lisa A. Napolitano65 Acceptance and Commitment Therapy for OC-Spectrum Disorders 1175Kate L. Morrison, Brooke M. Smith, Eric B. Lee, and Michael P. Twohig66 Family-based Conceptualization and Treatment of Obsessive-Compulsive Related Disorders 1193Eli R. Lebowitz and Josh GoltIndex 1208

Jonathan S. Abramowitz is Professor and Associate Chair of Psychology, at the University of North Carolina at Chapel Hill. He serves as the Director of Anxiety and Stress Disorders Clinic at UNC-Chapel Hill. Dr. Abramowitz has received multiple grants and awards for his research and contributions to the field of OCD and anxiety disorders, and has authored more than 250 articles, book chapters, and books. Dean McKay is Professor in the Department of Psychology, Fordham University and former President of the Association for Behavioral and Cognitive Therapies (ABCT). Dr. McKay has published over 170 articles and book chapters, and edited or co-edited 14 books related to the treatment of complex cases in children and adults, OCD, disgust in psychopathology and research methodology. Eric A. Storch is Professor and All Children's Hospital Guild Endowed Chair in the Departments of Pediatrics, Psychiatry and Behavioral Neurosciences, and Psychology at the University of South Florida. Dr. Storch has published 12 books and over 450 articles and chapters on topics relating to the nature and treatment of childhood and adult OCD, anxiety disorders, and anxiety among youth with autism.

• List of Contributors viiiIntroductionObsessive-Compulsive and Related Disorders: Where Have We Been? 1Dean McKay, Jonathan S. Abramowitz, and Eric A. Storch1 Description and Prevalence of OCD in Children and Adolescents 5Sophie C. James, Lara J. Farrell, and Melanie J. Zimmer]Gembeck2 Diagnostic Description and Prevalence 24Andrew G. Guzick, Adam M. Reid, Amanda M. Balki, Cindi Flores,Anyaliese D. Hancock]Smith, Brian Olsen, Greg Muller, Gary R. Geffken, and Joseph P.H. McNamara3 Description and Prevalence of OCD in the Elderly 44Mary E. Dozier and Catherine R. Ayers4 Cross-Cultural Phenomenology of Obsessive-Compulsive Disorder 56M. T. Williams, L. K. Chapman, J. V. Simms, and G. Tellawi5 Diagnostic Assessment and Measures of Symptom Severity for OCD in Adults 75Kevin D. Wu6 Measures for Diagnosing and Measuring Severity of OCD Symptoms in Children 95Hannah Frank, Elyse Stewart, Jennifer Herren, and Kristen Benito7 Functional Assessment 124Lillian Reuman and Jonathan S. Abramowitz8 Assessment of Cognitive Distortions and Cognitive Biases 138Patrick A. Vogel and Stian Solem9 A Critical Review of Neuropsychological Functioning and Heterogeneity in Individuals with Obsessive-Compulsive Disorder 155Michael J. Larson and Ann Clawson10 An International Perspective on Obsessive-Compulsive Disorder Assessment 176Miquel A. Fullana, Clara López]Sola, Lorena Fernández de la Cruz, and Pino Alonso11 Using Objective Personality Assessment for Effective Treatment Planning 209Caleb W. Lack and Brittany M. Riggin12 Psychological Models and Treatments of OCD for Adults 223Noah C. Berman, Rachel Schwartz, and Jennifer Park13 Psychological Models and Treatments for OCD in Children 244Amy Przeworski and Jennifer M. Birnkrant14 Biological Models and Treatments for OCD in Adults 261S. Evelyn Stewart and Adrian S. Loh15 Neurobiological and Neurodevelopmental Perspectives on OCD and their Clinical Implications 283Tord Ivarsson, Bernhard Weidle, Gudmundur Skarphedinsson, and Robert Valderhaug16 Pharmacological Augmentations of SRIs for Obsessive Compulsive Disorder 311Eric W. Leppink and Jon E. Grant17 Contamination Fear and Avoidance in Adults 341Dean McKay and Sean Carp18 Contamination Concerns in Children and Adolescents 352Robert R. Selles, Elysse A. Arnold, and Eric A. Storch19 Responsibility, Checking, and Reassurance-seeking in OCD 361Rachael L. Neal, Gillian M. Alcolado, and Adam. S. Radomsky20 Harm Avoidance and Checking Rituals in Pediatric Obsessive Compulsive Disorder 377Michelle Rozenman, Allison Vreeland, and Tara S. Peris21 Symmetry, Ordering, and Arranging Symptoms in Adults 395Steven Taylor22 Symmetry and Ordering in Youth with Obsessive Compulsive Disorder 405Amy M. Jacobsen and Ashley J. Smith23 Repugnant Obsessions: Phenomenology, Etiology, and Treatment 421David A. Clark and Catherine A. Hilchey24 Unacceptable Obsessional Thoughts in Children and Adolescents 441Carly Johnco and Eric A. Storch25 Mental Contamination 457Anna E. Coughtrey, Roz Shafran, and Sophie Bennett26 Obsessive-Compulsive Problems in Very Young Children 474Tommy Chou, Mariah DeSerisy, Abbe M. Garcia, Jennifer B. Freeman, and Jonathan S. Comer27 Insight in Obsessive-Compulsive Disorder 492Monica S. Wu and Adam B. Lewin28 Postpartum Obsessive-Compulsive Disorder 511Shannon M. Blakey and Jonathan S. Abramowitz29 Understanding and Treating Scrupulosity 527Jedidiah Siev, Jonathan D. Huppert, and Shelby E. Zuckerman30 Assessment and Treatment of Relationship]Related OCD Symptoms (ROCD): A Modular Approach 547Guy Doron and Danny Derby31 Exposure Therapy 565Shannon M. Blakey, Lillian Reuman, Ryan J. Jacoby, and Jonathan S. Abramowitz32 Cognitive Therapy for Obsessive-Compulsive Disorder 581Morag Yule and Maureen L. Whittal33 Acceptance and Commitment Therapy for OCD 596Brooke M. Smith, Ellen J. Bluett, Eric B. Lee, and Michael P. Twohig34 Family-Based Conceptualization and Treatment of Obsessive-Compulsive Disorder 614Cynthia Turner, Georgina Krebs, and Jessie Destro35 An Interpersonal Perspective on the Conceptualization and Treatment OCD 632Jonathan S. Abramowitz36 Metacognitive Model and Treatment of OCD 644Adrian Wells, Samuel Myers, Michael Simons, and Peter Fisher37 Computer-Aided Interventions for Obsessive-Compulsive Spectrum Disorders 663Erik Andersson, David Mataix]Cols, and Christian Rück38 Neurosurgical Treatments for Obsessive Compulsive Disorder 681Sarah M. Fayad and Herbert E. Ward39 Obsessive Compulsive Disorder and Comorbidity: Rates, Models, and Treatment Approaches 697Neil A. Rector, Jesse Lee Wilde, and Margaret A. Richter40 Obsessive Compulsive Personality Disorder 726Michael G. Wheaton and Anthony Pinto41 Pediatric Acute-onset Neuropsychiatric Syndrome 743Margo Thienemann and Tanya K. Murphy42 Phenomenology of Tourette Syndrome 762Jennifer M. Park, Abigail Stark, and Thilo Deckersbach43 Body Dysmorphic Disorder 774Andrea Sabrina Hartmann and Naomi Lyons44 Phenomenology of Health Anxiety 790John R. Walker and Patricia Furer45 Phenomenology of Excoriation (Skin Picking) Disorder 806Lauren S. Hallion, Esther S. Tung, and Nancy J. Keuthen46 Phenomenology of Trichotillomania 817David C. Houghton and Douglas W. Woods47 Phenomenology of Hoarding Disorder 832Mary E. Dozier and Catherine R. Ayers48 Obsessive-Compulsive and Related Disorders in Ethnoracial Minorities: Attitudes, Stigma, and Barriers to Treatment 847Monnica Williams, Broderick Sawyer, Melissa Ellsworth, Sonia Singh, and Ghazel Tellawi49 Diagnostic and Severity Measures for Adults with Obsessive-Compulsive Related Disorders 873Stephanie Taillefer and Martin M. Antony50 Diagnostic and Severity Measures for Children and Adolescents with Obsessive-Compulsive and Related Disorders 890Joseph F. McGuire, Erin M. Brennan, and Eric A. Storch51 Functional Assessment of Obsessive-Compulsive Related Disorders 912Caroline S. Holman, Brittany Rohl, and Margaret S. Andover52 Assessment of Obsessive-Compulsive Related Disorders from an International Perspective 924Marina Iniesta-Sepúlveda, Ana I. Rosa-Alcázar, and Ángel Rosa-Alcázar53 Psychological Treatment of Tourette Syndrome 941Michael B. Himle and Krishnapriya Ramanujam54 Treatment of Body Dysmorphic Disorder 962Lauren Mancusi, Rachel Ojserkis, and Dean McKay55 Treatment of Health Anxiety 977Steven Taylor and Gordon J. G. Asmundson56 Psychological Treatment of Excoriation Disorder 990Ivar Snorrason, Amy R. Goetz, and Han-Joo Lee57 Psychological Treatment of Trichotillomania 1009Sarah K. Francazio, Yolanda E. Murphy, and Christopher A. Flessner58 Psychological Treatment of Hoarding Disorder 1023Randy O. Frost, Hannah Trumbo, and Rachel Goar59 Biological Models and Treatments for Obsessive-Compulsive Related Disorders for Adults 1039Robert Hudak, Xenia Borue, and Mehak Sharma60 Biological Models and Treatments for Obsessive-Compulsive and Related Disorders for Children and Adolescents 1061Paul Arnold and Sefi Kronenberg61 The Nature and Management of Older Adults’ Obsessive-Compulsive and Obsessive-Compulsive-Related Disorders 1097John E. Calamari, Chelsey M. Wilkes, and Caroline Prouvost62 Sensory Phenomena in Obsessive-Compulsive Related Disorders 1119Maria Conceição do Rosário, Ana Gabriela Hounie, and Ygor Ferrão63 Comorbidity in Obsessive-Compulsive and Related Disorders 1133Ilana Frydman, Paula Vigne, Gabriela M. Ferreira, André Luís Campos-Lima, Leonardo F. Fontenelle, and Gabriela Bezerra de Menezes64 Emotion Regulation in the Obsessive-Compulsive Spectrum Disorders 1152Lisa A. Napolitano65 Acceptance and Commitment Therapy for OC-Spectrum Disorders 1175Kate L. Morrison, Brooke M. Smith, Eric B. Lee, and Michael P. Twohig66 Family-based Conceptualization and Treatment of Obsessive-Compulsive Related Disorders 1193Eli R. Lebowitz and Josh GoltIndex 1208