Health Reform Insider - August 8, 2011 - InsideHealthPolicy.com: "There has been stronger interest among stakeholders in the Pioneer ACOs than in the health reform law's ACOs for Medicare that were outlined in CMS' proposed rule in March. Pioneer ACOs are viewed as more flexible in such areas as payment methodology, payor participation and assignment of beneficiaries into the ACOs. However, several aspects of the Pioneer demonstration are dependent on the final ACO rule, such as the number of quality measures Pioneers will have to meet."