We have to do a weekly assignment sheet that goes home in the Friday Folder along with graded work. The bottom portion gets signed and returned. It has the child's name, behavior report and says "your child recieved a 69% or below in the following subjects:". Then all the subjects are listed. If any papers are 69 or below, the subject gets circled. The parents signs the bottom. Under the signature it says "your signature indicates that you have seen your child's papers and behavior report."
It is a great system. A parent can never claim that they were not aware of a bad grade or of a behavior issue. This is school-wide.