When we participate in a critique session, whether giving or receiving, we want to make the best use of everyone’s limited time as well as provide and come away with the most useful information. We can do both if we keep the essential things in mind.
Writing professional Janie Sullivan has posted a great article about the art of literary critique on her blog, Center for Writing Excellence. The key thing to remember is that a critique is an opinion, rather than an edit. Be sure to read the whole post (which is brief and wonderfully concise) because the devil is in the details, as we all know.