Supplemental Material Additional Contributors The author would like to thank the following Forrester analysts for their additional contributions to this report: Amy Bills, Rick Bradberry, Steven Casey, Cristina De Martini, Paul Ferron, Amy Hayes, Ian Bruce, Nick Buck, Maria Chien, Kathy Contreras, Phyllis Davidson, Dawn Ferrara, Dave Frankland, Lisa Gately, Brett Kahnke, Craig Moore, Rani Salehi, Christina Schmitt, Zachary Stone, and Karen Tran.