This one can be a little tricky to fit into your workload reduction toolkit because pupils will attempt to get away with writing the bare minimum. There have been countless times when I’ve seen pupils write “good work” or “nothing” in the WWW and EBI sections of their partner’s assessment. Make a point to explain the kind of feedback you expect and encourage pupils to be impartial when marking. The purpose of peer assessment is to make the work they produce more effective. It's hard to do that with bias or lazy feedback.