Take Home Messages• An Ideal Care System should incorporate fundamental elements of control engineering, such as effective and data-driven sensing, computation, actuation, and feedback.• These systems must be carefully and intentionally designed to support clinical decision-making, rather than being allowed to evolve based on market pressures and user convenience.This chapter presents ideas on how data could be systematically more effectively employed in a purposefully engineered healthcare system. We have previously written on potential components of such a system-e.g. dynamic clinical data mining, closing the loop on ICU data, optimizing the data system itself, crowdsourcing, etc., and will attempt to 'pull it all together' in this chapter, which we hope will inspire and encourage others to think about and move to create such a system [1][2][3][4][5][6][7][8][9][10]. Such a system, in theory, would support clinical workflow by [1] leveraging data to provide both accurate personalized, or 'precision,' care for individuals while ensuring optimal care at a population level; [2] providing coordination and communication among the users of the system; and [3] defining, tracking, and enhancing safety and quality. While health care is intrinsically heterogeneous at the level of individual patients, encounters, specialties, and clinical settings, we also propose some general systems-based solutions derived from contextually defined use cases. This chapter describes the fundamental infrastructure of an Ideal Care System (ICS) achieved through identifying, organizing, capturing, analyzing, utilizing and appropriately sharing the data.