Each year, J.D. Power and Associates surveys original owners of three-year-old vehicles to find out what kinds of problems they have had experienced over the last 12 months, and then it uses this data to create its annual Vehicle Dependability Study.
http://www.autoblog.com/2013/02/13/j-d-power-vehicle-dependability-at-all-time-high-lexus-and-po/