Pupils would add to themselves what is a side view, front view, floor plan, how and where the examined object is projected. etc. It unnecessarily complicated the whole otherwise well-prepared hour. 8th grade, mathematics. I taught the use of Pythagorean theorem (word problem) when working with a weaker group of students.
In this way, the pupils drew everything into notebooks in class and there were big problems with not knowing how to draw the projection corner, what dimensions to use, etc.