What is your initial reaction to letting other students grade each others papers?  At first I was very hesitant when I read that in an article written by Robert Rose of the Huffington Post. His article titled Critical Thinking: Impossible in Schools explains how Jack Stafford has taught critical thinking in schools by building a safe enviroment and letting students grade each others papers.  He also gives the basic elements of critical thinking: Clarity, Accuracy, Depth, Relevance and Fairness.  This is a great article and everyone should read it.  Teaching critical thinking in schools is a necessity.