In 1973, Ostrom and her husband founded the Workshop in Political Theory and Policy Analysis at Indiana University. Examining the use of collective action, trust, and cooperation in the management of common pool resources (CPR), her institutional approach to public policy, known as the Institutional analysis and development framework (IAD), has been considered sufficiently distinct to be thought of as a separate school of public choice theory. She authored many books in the fields of organizational theory, political science, and public administration. Elinor Ostrom was a dedicated scholar until the very end of her life. Indeed, on the day before she died, she sent e-mail messages to at least two different sets of coauthors about papers that she was writing with them. She was the chief scientific advisor for the International Council for Science (ICSU) Planet Under Pressure meeting in London in March, and Johan Rockstrom of the Stockholm Resilience Centre wrote that "Lin, up until the very end, was heavily involved in our preparations for the Nobel laureate dialogues on global sustainability we will be hosting in Rio 17th and 18th of June during the UN Rio+20 Earth Summit. In the end, she decided she could not come in person, but was contributing sharp, enthusiastically charged, inputs, in the way only she could."