Just catching up: this is from earlier this year. Worth a read.
How do you make failure students’ friend? Set a high standard and don’t be afraid to tell students that they haven’t met it. But in the next breath, give detailed suggestions on what they can do to improve. And, most important — though so often given short shrift — allow students the time, space, and support to make the revisions. In such a culture, failure does not mean, “You lose.” It means, “You can do better. We believe in you. Here is some feedback: revise, and try again.”