It is easy to underestimate the power of ARCADE, and view the data sheets you see in the laboratories as like a simple spreadsheet. You should remember that the laboratory data forms a simple model of the relevant behaviour of the students in your laboratories, and ARCADE interprets this model to automatically send email feedback to the students and their tutors, and award final marks. Thus it is important to try to get this model right, that is, to make it reflect a sensible view of reality.