(a) Structured, field-based training must be focused on actual experiences with each of the standards identified in §239.55 of this title (relating to Standards Required for the School Librarian Certificate) to include actual library experiences with diverse types of students, grade levels, and campuses.(b) An educator preparation program must develop and implement specific criteria and procedures that allow a candidate to substitute related experience and/or professional training directly related to the standards identified in §239.55 of this title for part of the preparation coursework or other program requirements.