DEBORAH C. BEIDEL is Trustee Chair and Pegasus Professor of Psychology and Medical Education, the University of Central Florida.DANAE L. HUDSON is a professor of psychology at Missouri State University.BROOKE L. WHISENHUNT is Professor of psychology at Missouri State University.PREETI KAPUR is Associate Professor (Retd.) at Daulat Ram College, University of Delhi.TABLE OF CONTENTS –1. Psychological Disorders: Historical and Modern Perspectives Research Methods 3. Assessment and Diagnosis 4. Anxiety and Trauma- and Stressor-Related Disorders 5. Obsessive-Compulsive and Impulse-Control Disorders 6. Somatic Symptom and Dissociative Disorders 7. Mood Disorders 8. Feeding and Eating Disorders 9. Gender Identity, Sexual Functioning, and Paraphilic Disorders 10. Substance-Related and Addictive Disorders 11. Schizophrenia Spectrum and Other Psychotic Disorders 12. Personality Disorders 13. Neurodevelopmental, Disruptive, Conduct, and Elimination Disorders 14. Aging and Neurocognitive Disorder