Why It Works
Although just about every customer knows that they can't have everything they want in a product, they also know that, until you work with them to prioritize features, they have the upper hand in asking you for whatever they want. Perhaps more importantly, features of complex products are interrelated, and the product design and development team often faces a continuum of possible solutions that could meet customer needs. Asking your customers to prioritize a list of features without providing them the opportunity to explore design continuums or dependencies often results in misunderstanding. By facilitating discussions of feature priorities with several customers, you will give them the chance to explore design continuums and relationships that result in a better understanding of market needs.
Time Frame of Action