I use letter grades instead of numbers, since I do not need 35 versions of passing and 64 versions of failing. However, for ranking purposes, I need to convert my letters to numerical equivalencies. For your convenience, here is a list of my scores and their numerical eqivalents.
Not There Yet (NTY)=60: Student is attempting the work, but is not adequately proficient
Incomplete (INC)=0: Student is not finished with an assessment or assignment, possibly due to absence; grade will change when work is done
Not Handed In (NHI)=0: Student has not handed in an assignment