During the period 2000 - 2010, Arbor Research and the University of Michigan administered the SRTR. The fundamental purpose of the SRTR is to provide useful data resources and analytic support to the transplant community. This analytic support is fueled in large part by candidate, recipient, and deceased and living donor data on all kidney, pancreas, liver, intestine, heart, lung, and heart/lung transplants generated and submitted by members of the Organ Procurement and Transplantation Network (OPTN), which includes all U.S. transplant programs, organ procurement organizations (OPOs), and histocompatibility laboratories. These data, which are supplemented by the SRTR with extra ascertainment from additional sources of information, are used to support the ongoing evaluation of the scientific and clinical status of solid organ transplantation.