They spoke about the influence of their audience on their writing:
Slaughter said that she satisfies herself first, "I write what I want to be writing, not what I think fans want."
Cronin thought of himself as a reader while he was writing The Passage. "I was feeling nostalgic for the great big fat stories ... plot driven stories" that he loves reading, so he took that mindset to his writing.
In order to control the quality of his work, Child writes every story "as if it is my first book and my last book."
They also discussed the nature of expanding a series:
Child cautioned, "with a series the huge danger is getting lazy ... or falling in love with a character" as these two sins ineviably kill a series.
Cronin knew he needed three books to tell this story, but it was "just an idea - this wonderful toy I could play with and see what happened."