Editing is one of the more challenging writing skills. If we're looking at Moffet's hierarchy of student thinking, this is asking students to reach their highest and most abstract level of knowledge - grammar - and apply it to their own or a peer's writing. This is an incredibly difficult task! If your students are like mine, this is complicated by the fact that they're not knowledgeable of the rules of grammar or of formal writing. Last year, I wrote and started implementing my own editing…