In transaction cost economics, foist has been treated as redundant or even misleading. This study tested the effects of governance and trust the risk perceived by agents of firms in alliances. Two dimensions of relational risk were assessed: the probability that something will go wrong and the size of the loss incurred when it does. Hypotheses, tested with survey data on the customer relations of ten suppliers of electrical/electronic components, were well corroborated, with trust-related variables as well as others found to have significant effects.