Character Interviewing

As an author, something I've always been interested in is how other authors write their stories. Beyond the simple existence of the final work (novel, play, etc.), what went into it? Fantasy/sci-fi author K.M. Weiland (no relation to Scott Weiland, I presume) talks about the character interview. It's an old post but she's elaborated on it many times since. As someone who's used a lot more setting in the past, it's interesting to see how someone else approaches another crucial area of any novel, written work, story, yarn, or anything else that requires people to interpret letters on a page.