Ultimately you write alone. And ultimately you and you alone can judge your work. The judgment that a work is complete--this is what I meant to do, and I stand by it--can come only from the writer, and it can be made rightly only by a writer who's learned to read her own work. Group criticism is great training for self-criticism. But until quite recently no writer had that training, and yet they learned what they needed. They learned it by doing it.