AbstractI motivate and defend a new way of theorising about trust and trustworthiness – and their relationship to each other – by locating both within a broader picture that captures largely overlooked symmetries on both the trustor's and trustee's side of a cooperative exchange. The view defended here takes good cooperation as a theoretical starting point; on the view proposed, cooperation between trustor and trustee is working well when achievements in trust and in responding to trust are matched on both sides of the trust exchange. In a bit more detail, the trustor ‘matches’ her achievement in trusting (an achievement in fitting reliance to reciprocity) with the trustee's achievement in responding to trust (an achievement in fitting reciprocity to reliance). From this starting point, we can then appreciate symmetrical ways that the trustor and trustee can (respectively) fall short, by violating what are shown to be symmetrical evaluative norms – of success, competence and aptness – that regulate the attempts made by both trustor and trustee. The overall picture has important advantages over the received way of theorising about how trust stands to trustworthiness, and it clears the way – by identifying key questions that have been obscured – to making further progress.