THE INTERNATIONAL BESTSELLER: OVER HALF A MILLION COPIES SOLD Matthew Dixon and Brent Adamson share the secret to sales success: don't just build relationships with customers. Challenge them! What's the secret to sales success? If you're like most business leaders, you'd say it's fundamentally about relationships - and you'd be wrong. Matthew Dixon, Brent Adamson, and their colleagues at CEB have studied the performance of thousands of sales reps worldwide.