School staff should be adequately trained in their various fields, and there should be satisfactory evidence of continuing professional competence. Instructors shall have a minimum of 2 years of successful practical experience in the occupation or subject or its equivalent in formal training beyond the standard learning period recognized for the trade or occupation that they are to teach. Instructors shall demonstrate up-to-date knowledge and continuing study of the field they are teaching. Instructors shall possess, and have maintained for a minimum of 2 years, at least the level of licensure, certification, or credential for which the program they are instructing prepares graduates. The qualifications of the instructional staff shall be documented in their personnel files, including but not limited to evidence of formal educational attainment, certificates and degrees earned, and relevant experience. There shall be at least one instructor present in each separate area where training is being conducted. During the period an instructor is scheduled to train students, an instructor's responsibilities shall be limited to instructing, monitoring students' attendance and academic progress, and otherwise assisting students. Except under extraordinary circumstances, an instructor may not perform non-training-related functions including, but not limited to, admissions and collections during the hours the instructor is scheduled to train students. Clinical or laboratory assistants and other aides to instructors shall work at all times under the direct supervision of a qualified instructor and may not independently instruct or train students. The teaching load for faculty shall be in accord with sound educational practice. The instructor-student ratios shall be in accord with sound educational practice.