1) The original stories were written for a science-fiction magazine and were from 7,000 to 50,000 words long, and no more. Consequently, each book in the trilogy had at least two stories and lacked unity. I intended to make the new book a single story.

2) I had a particularly good chance for development since Hugh said, "Let the book find its own length, Isaac. We don't mind a long book." So I planned on 140,000 words, which was nearly three times the length of "The Mule," and this gave me plenty of elbow-room, and I could add all sorts of little touches.

3) The Foundation series had been written at a time when our knowledge of astronomy was primitive compared with what it is today. I could take advantage of that and at least mention black holes, for instance. I could also take advantage of electronic computers, which had not been invented until I was half through with the series.

The novel progressed steadily, and on January 17, 1982, I began final copy. I brought the manuscript to Hugh O'Neill in batches, and the poor fellow went half-crazy since he insisted on reading it in this broken fashion. On March 25, 1982, I brought in the last bit, and the very next day got the second half of the advance.

I had kept "Lightning Rod" as my working title all the way through, but Hugh finally said, "Is there any way of putting 'Foundation' into the title, Isaac?" I suggested Foundations at Bay, therefore, and that may be the title that will actually be used 

You will have noticed that I have said nothing about the plot of the new Foundation novel. Well, naturally. I would rather you buy and read the book.

And yet there is one thing I have to confess to you. I generally manage to tie up all the loose ends into one neat little bow-knot at the end of my stories, no matter how complicated the plot might be. In this case, however, I noticed that when I was all done, one glaring little item remained unresolved.