classes:  lecturer. The theory may be very good but the assignment may be a little vague in knowledge, very often confused.  curriculum. The theory may be very good but the assignment may be a little vague in knowledge, very often confused.  facility. The theory may be very good but the assignment may be a little vague in knowledge, very often confused.  general. The theory may be very good but the assignment may be a little vague in knowledge, very often confused.