Top salespeople will take the answer "no" and just keep trying to turn it into a "yes." So says a recent Harvard Business School study. In addition to having this dogged determination, successful salespeople are also:

* Intensely goal-oriented

* Highly ambitious

* Willing to take responsibility for sales results irregardless of outside circumstances

* Able to empathize with their customers

* Self-disciplined

* Extroverted

* Honest