My stepson is 14 and in 8th grade.  This year he has suddenly stopped writing down his assignments and therefore doesn't complete many of his assignments resulting in poor grades.  How do we get him to remember to write down his assignments?

He is smart and gets As usually on his tests but has Cs or Ds in some classes due to his homeowrk  issues.  I tried checking his agenda and his homework to make sure it's complete but that didn't solve the problem.  With a little more digging I realized it was that he isn't writing down the assignments.

Any suggestions? 

any suggestions on consequences?  We also told him that his computer time is limited frmo 3 - 5 and then homework and whatever else.  We also told him to write none or N/A if there is no homeowrk but he isn't doing that so I just don't know what to do.