External technology sourcing: The effect of uncertainty on governance mode choice What this paper is about Although all these sourcing modes are important for firms to consider, prior studies have often limited their attention to one or two governance modes in particular. In spite of our focus on this broad array of external technology acquisition modes we will pay particular attention to the effect of exogenous and endogenous uncertainty on the choice between different governance modes for external technology sourcing. First, we will provide a more detailed background to develop some hypotheses on how different types of uncertainty affect the choice for more or less integrated governance modes. What you can learn CVC investments, minority holdings and M. As are favored over joint ventures, and minority holdings are preferred over M. As, but the data show no significant differential effect of environmental turbulence on the preference for CVC investments over minority holdings or M. As a result, the first hypothesis is partly supported by the data, as strategic alliances are the most favorable option, but we did not find a linear ranking from less to more integrated governance modes. However, the results also imply that when the technology is new, CVC investments are preferred over non-equity alliances and minority holdings, which in turn are preferred over joint ventures and M. Thus, contrary to our expectations, technological newness leads only to some extent to the use of less integrated governance modes: while M. As and joint ventures become less attractive, there is a clear preference for the companies in this study to choose CVC investments over all other governance modes. This result shows that the uncertainty related to the newness of partners' technology is considered by the focal firms as different from technological turbulence. However, technological distance between partners does also lead to a preference for nonequity alliances over minority holdings, and no differential effect is found between nonequity alliances and joint ventures and M. The odds ratios in furthermore show that when technological distance between firms increases, there is an increased tendency to use CVC investments over non-equity alliances and non-equity alliances over minority holdings. holdings, and M. As, but no effect on the choice of joint ventures. In this study we have tested the effect of both exogenous and endogenous uncertainty on the choice between nonequity technology alliances, corporate venture capital investments, minority holdings, joint ventures and mergers and acquisitions. For instance, prior cooperation might interact with the effect of different types of uncertainty on governance mode choice.