In a new blog post, Commonwealth Fund researchers Douglas McCarthy, Martha Hostetter, and Sarah Klein consider how new rules to redesign health care—proposed by an Institute for Healthcare Improvement (IHI) alliance of 40 health system leaders—might guide improvements for vulnerable patients and those with high needs and high costs. Also see highlights from a June 3rd tweet chat about redesigning health care in the U.S. and abroad. Featured participants include the IHI’s Donald Berwick, M.D., Elliott Fisher, M.D., of the Dartmouth Institute for Health Policy and Clinical Practice, and Jenn Verma of the Canadian Foundation for Healthcare Improvement.