Climbing costs and lengthy time frames of clinical trials are significant bottlenecks in medical product development. Despite the fact that scientific discoveries yield many new possible targets for developing into therapies, the capacity and resources with which to develop these targets are limited, thereby leaving potentially valuable discoveries undeveloped and unrealized. Under the aegis of the Clinical Trial Site Standards Harmonization Action Collaborative ("the Collaborative") of the Forum on Drug Discovery, Development, and Translation of the National Academies of Sciences, Engineering, and Medicine, clinical research stakeholders set out to discuss opportunities to improve clinical trial site functioning, with the goal of increasing productivity in medical product development. Our conclusion: harmonization of standards for clinical trial sites has significant promise in improving clinical trials. Standards would also be essential to the formation of a site accreditation system in the United States, should a consensus emerge on the need for such a system. This paper synthesizes the results of the work conducted to inform discussions of the Collaborative. This paper may serve as a launching point for harmonizing requirements applied to clinical trial sites and the development of standards. A clinical trial infrastructure that reduces redundancies and increases efficiencies would, in turn, accelerate the pace and productivity of new product development, to the benefit of patients and society. DISCUSSION PAPER Perspectives | Expert Voices in Health & Health Care Investing More, Producing Less Patients are in need of new medicines to treat an array of rare, common, and complex diseases. By its nature, the development of a new medicine, vaccine, device, or diagnostic is a careful process, one executed in keeping with the cardinal rule of medicine: "First, do no harm." Today, however, biopharmaceutical development faces an efficiency crisis, and the stakes for reform are high. Without a substantial increase in the rate of clinical success and subsequent drug approvals, many observers believe innovators will be unable to bring forward enough new medicines to sustain investment in research and development (R&D) activities [1]. The costs of development have skyrocketed, but