I do not like the self-assessment software that comes with Desire2Learn, my institution's chosen LMS. It is semester break, and I'm writing my own self-assessment software. My software identifies wrong answers, marks right answers, and provides feedback for all incorrect answers and any correct answers where the student requests it. These electronic quizzes are delivered anonymously and in no way affect the student's grade.
I asked a colleague to do an informal peer review of the software, and she complained that no score is calculated. I did that on purpose in the belief that scoring could discourage the student who needs to put forth more effort. My colleague says the score is what tells students they need to work harder.
So, my non-opinion-based question is, is there any research one way or another concerning scoring self-assessments?