The main thesis of this chapter is that when we trust the results of scientific research, that trust is inevitably directed at least in part at collective bodies rather than at single researchers. The chapter argues that the trustworthiness of a collaborative research group does not supervene on the trustworthiness of its individual members. In addition, the social diffusion of trustworthiness requires an assessment of the trustworthiness of the respective research community as a whole. Communities play an essential role in the epistemic quality management of science. This is supported by consideration of what is desirable in a method of inquiry: the reliability of positive results, the reliability of negative results, and the method’s power. Every methodological choice involves a trade-off between these three dimensions, and we must trust that the research community has set the limitations on this in a suitable way.