training. Doctoral internship—usually an intensive one or two-year placement in a clinical setting Dissertation—PhD programs usually require original quantitative empirical research, while PsyD dissertations involve original quantitative or qualitative research, theoretical scholarship, program evaluation or development, critical literature analysis or clinical application and analysis. The dissertation typically takes 2–3 years to complete. Specialized electives—many programs offer sets of elective courses for specializations, such as health, child/adolescent, family, community, or neuropsychology. Personal psychotherapy—many programs require students to undertake a certain number of hours of personal psychotherapy (with a non-faculty therapist) although in recent years this requirement has become less frequent. Comprehensive exams or master's thesis: a thesis can involve original data collection and is distinct from a dissertation. Psychologists can be seen as practicing within two general categories of psychology: health service psychology, which includes "practitioners" or "professionals" and research-oriented psychology which includes "scientists" or "scholars". The training models (Boulder and Vail models) endorsed by the APA require that health service psychologists be trained as both researchers and practitioners, and that they possess advanced degrees. Psychologists typically have one of two degrees: PsyD or PhD. The PsyD program prepares the student primarily as a practitioner for clinical practice (e.g., testing, psychotherapy), but also as a scholar that consumes research. Depending on the specialty (industrial/organizational, social, clinical, school, etc.), a PhD may be trained in clinical practice as well as in scientific methodology, to prepare for a career in academia or research. Both the PsyD and PhD programs prepare students to take the national psychology licensing exam, the Examination for Professional Practice in Psychology (EPPP). Within the two main categories are many further types of psychologists as reflected by APA's 54 Divisions, which are specialty or subspecialty or topical areas, including clinical, counseling, and school psychologists. Such professionals work with persons in a variety of therapeutic contexts. People often think of the discipline as involving only such clinical or counseling psychologists. While counseling and psychotherapy are common activities for psychologists, these health service psychology fields are just two branches in the larger domain of psychology. There are other classifications such as industrial and organizational and community psychologists, whose professionals mainly apply psychological research, theories, and techniques to "real-world" problems of business, industry, social benefit organizations, government, and academia. APA-recognized specialties Clinical psychology Clinical neuropsychology Clinical child and adolescent psychology School psychology Behavioral and cognitive psychology Couple and family psychology Clinical health psychology