ON NOT DECIDING ON YOUR BACKSTORY TOO EARLY
…I don't like making decisions until you have to make them. In other words, I don't like talking about ... how many brothers and sisters does Bartlet have, are his parents still alive? Why don't you get to an episode where, if you have a really good story for Bartlet and his father then, well, now his father's alive... But if you want to tell stories about sort of the ghost father, and living with the idea that Bartlet's father never liked him, well, now he's died. It wasn't until I wrote Two Cathedrals -- the second season finale -- that we knew Bartlet's father was physically abusive. -- Aaron Sorkin, in On Writing #18
The issue also contains the entire pilot script, which otherwise you'd have to pay good money for.