“…Recent studies argue that R&D partnership portfolios, more than individual partnerships alone, represent key knowledge-gathering conduits that allow firms to leverage informational complementarities across their various R&D projects (Faems, van Looy, & Debackere, 2005;George, Zahra, Wheatley, & Khan, 2001;Munson & Spivey, 2006). Consistent with this view, several studies have shown empirical associations between R&D partnership portfolios and innovation (Powell et al, 1999;Rothaermel & Deeds, 2006;Soh, 2003;Stuart, 2000;Wuyts, Dutta, & Stremersch, 2004), while others have suggested a link between technological uncertainty and firms' proclivity to engage in multiple simultaneous R&D partnerships (Hagedoorn, 1993;Powell, Koput, & Smith-Doerr, 1996;Rosenkopf & Schilling, 2008).…”