Dissolved upon effective date of the 2005 OPTN contract, this group was mutually operated by the OPTN and SRTR contractors, and comprised representatives from both organizations as well as members of the transplant community and government staff. The DWG was charged with in-depth review and consideration of needed revisions (additions and deletions) to the OPTN database in order to comply with contract and regulatory requirements and to further solid organ transplantation research. The recommendations of the DWG were presented to the Data Advisory Committee (DAC) for consideration.