on Writers Helping Writers:

Years ago I joined the award-winning site, The Critique Circle, where I learned to hone my writing skills and develop the thick skin needed to take criticism and rejection. In addition to writing well beyond a thousand critiques, I became a moderator for the site, and with members in the thousands, I mediated situations that cropped up between writers who either struggled to give an appropriate critique, or to accept one.
This experience taught me the value of peer feedback. Learning how to give and take a critique is one of the best ways to develop your writing skills. Critiquing isn’t a walk in the park, however. It’s very easy to let one’s emotions get in the way and damage relationships. For this to work, a person must respect the other’s role, value the time and energy writing and critiquing takes, and follow through without letting emotions overrun good judgment or manners. Here are “best practices” writers should observe in each stage of the Critique Process.