The paper “Open innovation practices and their effect on innovation performance” by Carter Bloch, Sverre Herstad, Els Van De Velde and myself is accepted for publication with the International Journal of Innovation and Technology Management. The paper develops an indicator framework for examining open innovation practices and their impact on performance. The analysis, which is based on Community Innovation Survey (CIS) data for Austria, Belgium, Denmark and Norway, yields a number of interesting results. First, we find that open innovation practices have a strong impact on innovation performance. Second, results suggest that that broad-based approaches yield the strongest impacts, and that the collective of open innovation strategies appear more important than individual practices. Third, intramural investments are still important for innovative performance, stressing that open innovation is not a substitute for internal knowledge building.