“…At a more general level, our portfolio perspective on knowledge inflows aligns with recent interest among scholars and practitioners, who increasingly note that partnership portfolios represent an important level of analysis, above and beyond individual partnerships (Bamford & Ernst, 2002;Gulati, 2007;Hoffmann, 2007;Lavie, 2007;Mahnke, Overby, & Nielsen, 2006;Munson & Spivey, 2006;Parise & Sasson, 2002;Wassmer, 2010;Wassmer, Dussauge, & Planellas, 2010). Like internal project portfolios, external partnership portfolios exhibit aggregate compositional properties with crucial implications for understanding firm behavior and performance.…”