There's a great interview with Joan Wickersham in the 11th edition, 2015, of Upstreet. She discusses her ideas about writing. She's disciplined but in her own way. Once she's at work, she's focused but doesn't set any numeric demands or goals.
In writing, she looks for precision of words, beauty of the sentences and that the "consequences of the things you set in motion" are shown. I'm particularly interested in Wickersham's responses because she is not an M.F.A. person and she's as accomplished and talented as anyone else. Well, and I just like her writing a lot.