We have a daily communication folder that the aide writes in. She uses a form that has 4 sections - I can't remember all but it is basically broken down into - Behavious issues, social skills, challenges faced and other items.
Our setup is that the aide only deals with behaviour and motivation and all academics issues are the responsibility of the teacher. Any academic issues are communicated in his agenda by the teacher. For example - if he didn't do his homework and had a consequence. Sometimes if it is a particularly bad or good day there will be a short note from the teacher in the agenda also.
DS - 10
DD - 8
Twin Girls - 6