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Abstract
In this paper, the question is discussed of whether it is worthwhile to devote time to providing feedback to undergraduate Computer Science students before and after they do programming exercises. A comparative study was carried out in two different years of the same course taught by the same lecturer. In the first year, feedback was only provided after each exercise was finished, while in the second year feedback was provided both before and after each exercise was finished. The results confirm that even when the number of students is higher than one hundred; it is still worthwhile to provide feedback before and after each Computer Science exercise to achieve better scores, and a drastic decrease in the drop-out rate, which was reduced to zero.





