Each of my courses has (of course) a register, carefully designed. It lives on a clipboard in my room. When you come in to the room, find the register and sign against your name. Your signature is proof that you have attended that session: if the signature is not there, I will assume you were absent. Make sure you sign the register!
The important point is: you must provide an explanation for any absence. In writing, to me, by email (my email address is firstname.lastname@example.org).
On the register you will see that aginst your name there are two rows under each term week. The top row, marked 'abs', records absences; the bottom row, marked 'expl', is about explanations. If there is a '1' in the absence box there should be a '1' in the explanation box. Check each week to make sure you have no explanations outstanding, because I am required to report all of this, and want to get it right. If there are any errors, let me know.
Any two unexplained absences generate departmental action; these are our instructions.