"On distinguishing between helpful and unhelpful feedback, Stephen Brookfield gives this example:

Unhelpful feedback:

“This paper is terrific, well done. You’ve made a lot of progress this semester and you can feel well pleased with your efforts. Keep up the good work.”

Helpful feedback:

“This paper is terrific, well done. You’ve made a lot of progress this semester, particularly in three important areas:

1) You are much more careful about citing evidence in support of your arguments. For example, at the bottom of p. 12 you quote 3 sources to support your contention that critical thinking is a contested concept…..

2) You’ve taken much greater trouble to acknowledge viewpoints opposed to, and critical of, your own. A good example of this is your discussion on Skinner’s work on page 7.

3) You’re cutting down on your use of unnecessary jargon….”"

Source: The skilful teacher: On technique, trust, and responsiveness in the classroom, Brookfield, SD, 2015