Business venturing is associated with what is known as Akerlofian and Knightean uncertainties. In this study, we try to unpack the team states and process that enable new venturing teams (NVTs) to deal effectively with these types of uncertainties. Specifically, we argue that sociobehavioural integration is a precondition for effective venturing teams. Furthermore, we identify plausible mediating and moderating variables in the sociobehavioural integration-team effectiveness relationship to shed light on the process aspects. Specifically, we argue that team positive affective tone mediates the effect of sociobehavioural integration on NVT effectiveness, and that polychronicity—the extent to which team members’ value and prefer to work on several task simultaneously (Souitiaris and Maestro, 2009)—positively moderates the effect of sociobehavioural integration on NVT effectiveness.