This volume brings together a set of key writings of Nobel Prize in Economic Sciences co-recipient Elinor Ostrom and public choice political economy cofounder Vincent Ostrom, in which the two scholars introduce, elaborate and explain their approaches, conceptual frameworks and analytical perspectives to the study of institutions and institutional performance. The book brings together a number of texts representing the main analytical and conceptual vehicles articulated and used by the Ostroms and their collaborators in the creation of the so-called Bloomington School of public choice and institutional theory. The focus is hence on the conceptual lenses and theoretical apparatus that shaped the construction of their work; an attempt to illustrate them, via selected readings organized using a tentative interpretative framework. Its ultimate objective is not only to offer a direct introduction to the conceptual, theoretical and epistemic perspectives that shaped and inspired this prominent research program, but also to point out the fascinating intellectual avenues opened by the Ostroms' and that invite further exploration and investigation.--