Evaluation becomes complex and difficult when we take "diverse individualities of students" into account — without saying that every evaluation of 'quality' is affected by instructor's individuality itself. Still, evaluation is most important. The instructor is not allowed to evade responsibility by excusing "diversity" (using it as "relativity").
Points of evaluation are as follows :
Effective work procedure
Degree of understanding subjects (meaning/essence)
Quality of information design (logic, structure, expression) :