Make cock-up? - Fail, tick the box
Not strictly true.
Make cock-up. If relatively minor or with an easy solution. Verbal debrief, then do it again. If another cock up fail that bit. First attempt fail. Wait till end, then instructors hat on. Practice that bit until it is proficient. Then put testers hat back on. Do it again, if then not good enough. Second attempt fail. Fail check. If five or more first attempt fails. Fail check.
L337