The third in the PDMA Toolbook series for New Product Development was published in 2007. It contains juried articles written by product development experts that explain tools in such a way that you can use them immediately by applying the information provided. In part 2, chapter 4, Anne Orban and Chris Miller describe, in detail, the two-stage Slingshot group process for developing breakthrough ideas. The Slingshot group process also defines a new role- that of ‘prosumer’ as expert consumer, skilled idea generator and impartial challenger.