“… many novelists don't know the right opening for their novel until they reach the end. Thus, it's very important to keep pushing ahead, rather than to get bogged down rewriting the opening chapters.” in Podcast #25 Ellen Kushner and Delia Sherman on odysseyworshop.I’ve found this to be true with short stories also. I may have an idea for an ending when I start writing, but somewhere along the way one of the characters takes a detour. I don't fight against this happening anymore. Often the ending reached is more satisfying than the one I'd planned. And once I get to the end, it’s not unusual for me to go back and tinker with the opening paragraph, putting the beginning in synch with the conclusion.