The conventional wisdom is, of course, to write the series in story-chronological order. Write Book 1, which story-wise takes place earliest, then write book 2, which takes place next, and so on. Sometimes an author writes a prequel, or side book, or shoehorns one into the middle.
But it occurred to me that writing them out of order might yield big benefits.
Even if you're a damn fine author, a new series usually develops as it goes on. It often finds its voice and hits its stride in book 2 or 3 or even 4. You can see this principle at work in TV seasons and movie sequels as well--the first one is rarely the best.
But, for most of us genre fiction authors who depend on series, the Book 1 is the reader magnet. It tends to be discounted, either permanently or intermittently. It's the first thing a new reader of that series will read--and because of the principle above, it may well not be the best book in the series. But, it behooves us IMO to have Book 1 be the best book in the series--except for the very last book in the series, perhaps, the climax. Either way, though, for marketing, you want to put your best foot forward. Once readers are invested in characters, they can forgive a book being not quite spectacular, as long as it's good and gives them what they want.
So it seems to me that it might behoove us--okay, me, since I'm between series now--to write the series out of order. Say, deliberately write book 3 first, in order to get comfortable with the new characters and universe, to develop their voices and shake out the kinks. Then, write books 1 and 2 afterward. Then, go back over book 3 before publishing, in light of what I've learned, to smooth out any rough spots or to tweak anything that needs tweaking. This might yield a better, more enticing Book 1.
Thoughts?