I found these in an item from the Guardian Review, 14 November 2009 quoting research carried out by the Wall Street Journal.
- lying in bed, speaking to a laptop computer with voice recognition software
- taking on the clothes and appearance of a major character to get inside their mind
- drafting in notebooks, typing drafts then revising, then make a tape recording of reading the book
- reading books that characters might read
- writing in longhand and computer
- taking showers if you get stuck
To paraphase a well known quote,'If we always write in the way we've written, we may well always get the same results.