Yvonne Perry and Carol Denbow discuss the pros and cons about writing a book series. They specifically answer the following questions:

1. When one writes a series of books, do they write them all at once?
2. Is it considerably more expensive to publish a series at one time, or can it actually save you money in the long run?
3. If a writer is considering a book series, should she complete and publish one book at a time, or write and publish them all at once?

See http://abookinside.blogspot.com to read the entire interview.