Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Psychotherapy, or personal counseling with a psychotherapist, is an intentional interpersonal relationship used by trained psychotherapists to aid a client or patient in problems of living. Psychotherapists employ a range of techniques based on experiential relationship building, dialogue, communication and behavior change that are designed to improve the mental health of a client or patient, or to improve group relationships. These techniques are based on the principles of learning theory, operant and respondent conditioning, applied behavior analysis or behavior modification, acceptance and commitment therapy, functional analytic psychotherapy, and dialectical behavior therapy. This book studies various psychotherapeutic techniques including stimulus, aversives, sensitization, and hypnosurgery. Project Webster represents a new publishing paradigm, allowing disparate content sources to be curated into cohesive, relevant, and informative books. To date, this content has been curated from Wikipedia articles and images under Creative Commons licensing, although as Project Webster continues to increase in scope and dimension, more licensed and public domain content is being added. We believe books such as this represent a new and exciting lexicon in the sharing of human knowledge.