Question Based Selling ( QBS(R)) is a commonsense approach to sales, based on the theory that "what" salespeople ask - and "how" they ask - is more important than anything they will ever say. This technique makes sense because in order to present solutions, you first must learn your customer's needs. How? By asking the right questions.
Freeze, Thomas. Secrets of Question-Based Selling. Naperville, IL: Sourcebooks. 2000
YMMV
Couple of books I found useful :-
A more beautiful question - Warren Berger Power Questions - Andrew Sobel Secrets of Question Based Selling - Thomas Freese.
4 Steps to the Epiphany is a phenomenal book on selling new b2b IT products.
Secrets of Question-based Selling is the best consultative sales book
SPIN Selling by Neil Rackham is also quite good
Tested Advertising Methods and Scientific Advertising continue to be two of the best books on copywriting, despite being very old.
