Maintaining Professional Standards
The professional functions of these branches are guided and monitored by Psychological Associations in various nations. For example, the American Psychological Association is the standard setting and accreditation body for psychological practitioners and training institutions. Through local associations, people also become members of global bodies.
Specific disciplines of psychology train people in that discipline: educational psychologists train educational psychology students, while clinicians train clinicians. In the medical field, you cannot find dentists training neurosurgeons, or gynecologists training neurosurgeons because training goes beyond imparting academic knowledge to supervision and modeling of practice in the specific field.
When it comes to practice, educational psychologists work in education not in clinics because their training specialized them for education settings – schools, colleges, and universities. Such specialization is what mandates that all professional practice begins after MA level of training and above. In other countries, patients sue professional for malpractice, and anyone treating people without the basic training is liable for lawsuits in these locations.