I wrote this piece with Dr. Margrette Katherine Fugate from the College of Education as a result of considering adding extra credit assignments to her SPED courses. We found that there were ultimately many directions to take after we considered the pros/cons of adding EC at all.
link: https://ideabook.wp.txstate.edu/2021/12/07/extra-credit-to-give-or-not-to-give-that-is-the-question/