The Internship in School Psychology is the part of the training program that provides students and supervisors a chance to evaluate a student's knowledge and skills in a controlled but applied setting. It is viewed as an opportunity for the student to develop a professional identity and move toward assumption of full responsibilities as a school psychologist. The internship represents an opportunity to integrate all previous training experiences by means of practical application in schools and, in some cases, additional educational and mental health settings.

In compliance with NASP guidelines, the internship is provided at the end of the formal training period (i.e., after the completion of at least 54 graduate course hours, including at least 200 supervised practicum hours in schools and other appropriate settings). Complete and detailed requirements for the Mason School Psychology Training Program internship appear in a separate document entitled The School Psychology Internship: A Handbook of Guidelines.

Internships take place during the academic school year and typically commence in late August and terminate in mid-June for a total of approximately 1200 clock hours, with at least 600 hours in a school setting. Occasionally the internship is completed on a half-time basis over two consecutive years. Six (6) graduate credits are awarded upon completion of the internship.

Two people have primary responsibility for internship supervision. They are the George Mason University Internship Coordinator (the school psychology trainer) and the Field Supervisor (the on-site supervising school psychologist). Students and their experiences will be monitored carefully with both formative and summative performance-based evaluations. Communication between field supervisors and Mason faculty is ongoing.