Trauma-related dissociative disorders are increasingly being considered in therapeutic practice and the clinical literature. On the one hand, dissociative disorders are still too often overlooked; on the other hand, they are also (self-) diagnosed more frequently when not actually present. This book elaborates on the assessment of these disorders, using the diagnostic Instrument developed by Suzette Boon. First, this book addresses the dilemmas regarding the diagnostic criteria of dissociative disorders in the DSM-5 and ICD-11. It describes how to recognize symptoms as well as the role of traumatic experiences in the diagnosis. Several thematic chapters discuss key differential diagnostic considerations and illustrate them with case reports. Also discussed are the occurrence of false-negative and false-positive diagnoses of trauma-related dissociative disorders, the assessment of traumatic experiences, and the development of a treatment plan. Written for clinicians (psychiatrists, clinical psychologists, psychotherapists, and nursing specialists) who want to learn how to diagnose dissociative disorders, as well as colleagues who do not perform the assessment, this book provides a wealth of information to assist clinicians in recognizing patients with dissociative symptoms and referring them for specialized diagnostic testing.