I recently started using this weekly behavior sheet.
I send it home every Friday. I realized that I needed to be very specific about what behaviors I was seeing in class. These are the main ones that my students needed to work on. Parents really appreciate the communication and have a clear idea of how their child is in class. If there is an issue that arrises that is not on this sheet, I simply write a note on the back.
I also made a daily sheet for my students whose parents need daily communication. I have two students using a daily sheet this year because they are really working on improving their work traits and behavior. I usually add little notes on the back if I need to be more specific.