A learning diary has two overall purposes. It can help you to gain a clear idea of what the students have learned and the challenges they have faced during a course of teaching. And it can help the students to reflect on the teaching and their own learning process. The text should be a compulsory part of the students’ preparation which is not assessed with a grade. But you should give the students oral or written feedback.
The use of learning diaries in your teaching or between teaching sessions enables you to give the students the chance to reflect on what they have learned during the teaching, thereby developing their ability to reflect.
The activity provides you with feedback about how the students perceive your teaching and what they have learned from it. This will give you a clear idea of whether the teaching has had the desired effect.