Research on Midpoint Feedback
Cohen (1980) performed a meta-analysis of 17 studies that examined effects of midterm evaluation on improving teaching. He found that receiving feedback from student ratings administered during the first half of the term was positively related to improving teaching as measured by student ratings at the end of term. Similarly, Murray (2007) showed (on the basis of Murray & Smith, 1989) that midterm feedback with ratings of specific behaviors led to significant improvements of classroom teaching, as indicated by significantly higher ratings of Overall Teaching at the end of term. Murray concluded that under the right conditions, midterm feedback on specific teaching behaviors could significantly improve teaching.
Cohen, P. A. (1980). Effectiveness of student-rating feedback for improving college instruction: A meta-analysis of findings. Research in Higher Education, 13(4), 321-341.
Murray, H. G. (2007). Low-inference teaching behaviors and college teaching effectiveness: Recent developments and controversies. In R. P. Perry & J. C. Smart (Eds.), The scholarship of teaching and learning in higher education: An evidence-based perspective (pp. 145-200). Dordrecht, The Netherlands: Springer.
Murray, H. G., and Smith, T.A. (1989). Effects of Midterm Behavioral Feedback on End of-term Ratings of Instructor Effectiveness. Paper presented at annual meeting of the American Education Research Association, San Francisco.