Clinical psychology comprises the fastest growing subfield in the study of psychology, and it accounts for approximately half of all doctoral degrees earned within the field . There are two primary degrees awarded for doctoral study within psychology: the PhD and the PsyD. Briefly, the PhD holds a primary research focus in addition to clinical practice, while the PsyD is focused primarily on provision of clinical services. The PsyD, or the Doctor of Psychology degree, emerged in the 1970s and has since grown rapidly as a primary model of training for clinical psychology.
Most PsyD programs follow the scholar-practitioner model, also known as the Vail model. This type of training is characterized by emphasis on practical clinical training. In the course of this training, students also learn how to analyze and evaluate existing scientific research, and they may carry out their own original research, as well.
The PhD, or the Doctor of Philosophy, takes a balanced approach to research and clinical work. In addition to learning the practice of clinical psychology, the PhD emphasizes conducting research. This is the scientist-practitioner model, or the Boulder model. Students in PhD programs gain extensive training in the development, execution, and dissemination of research.