This article argues that Gilbert Simondon’s philosophy of technology is useful for both science and technology studies (STS) and critical theory. The synthesis has political implications. It offers an argument for the rationality of democratic interventions by citizens into decisions concerning technology. The new framework opens a perspective on the radical transformation of technology required by ecological modernization and sustainability. In so doing, it suggests new applications of STS methods to politics as well as a reconstruction of the Frankfurt School’s "rational critique of reason."