“…Poetz & Schreier (2012) also demonstrate that "user ideas clearly score higher on average in terms of novelty and customer benefit" than ideas developed by engineers or marketers. Lettl, Herstatt and Gemuenden (2006) defend that manufacturers can benefit from the users significantly, for example through consumers' contribution to innovation outcome (Frank, von Hippel and Schreier, 2006;Mahr, Lievens & Blazevic, 2013), their ability to come up with innovative and commercially valid ideas (Ogawa and Piller, 2006;Poetz and Schreier, 2012), to develop greater product variety and product lines (Al-Zu'bi and Tsinopoulos, 2012;Lilien et al, 2002), and finally to contribute to market performance (Baldwin, Hienerth and von Hippel, 2006;Hienerth, 2006;Nishikawa, Schreier and Ogawa, 2013). Thus, consumers are believed to add valuable insights to firm's new product development process (NPD).…”