Resource Library - White Papers and Reports IHA periodically publishes white papers and reports to disseminate information related to our key programs and areas of expertise. Accountable Care OrganizationsACO White Paper: Accountable Care Organization for PPO Patients - Challenge and Opportunity in California (2011) ACO White Paper: Accountable Care Organizations in California - Lessons for the National Debate on Delivery System Reform (2010) Pay for Performance P4P White Paper: The Second Chapter Executive Summary (2010) P4P White Paper: The Second Chapter Full Report (2010) P4P 2010 Program Results Report P4P 2009 Program Results Report P4P White Paper: Advancing Quality Through Collaboration (2006)