School Librarians need the 15 hours of PDPs, not the full SEI endorsement. The 15 PDPs must be related to training in strategies for effective schooling for students with disabilities and instruction of students with diverse learning style
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Massachusetts DESE: http://www.doe.mass.edu/retell/courses.html


School systems and collaboratives may offer professional development:
TEC: ​https://tec-coop.org/professional-development/courses-and-workshops/