Writing for the Health Affairs blog, PBGH CEO David Lansky argues that for ACOs to truly deliver better care at a better cost, participating providers must improve their performance

 in three ways: Delivering patient-centered care; measuring and improving outcomes; and doing better -- not more -- while maintaining competition. Read the full opinion piece at http://healthaffairs.org/blog/2011/04/22/accountable-care-organizations-an-opportunity-to-transform-care/ .