Neil Rackham and his team studied more than 35,000 sales calls made by 10,000 sales people in 23 countries over 12 years. Their findings revealed that many of the methods developed for selling low-value goods just don‘t work for major sales. Rackham went on to introduce his SPIN-Selling method. SPIN describes the whole selling process: SPIN-Selling provides you with a set of simple and practical techniques which have been tried in many of today‘s leading companies with dramatic improvements to their sales performance.