Although Toyota and Honda still lead, the Big Three U.S. domestic automakers are improving in terms of their relationships with suppliers, according to Planning Perspectives' 11th annual Automaker-Supplier Working Relations Rankings report released May 23. Japanese automakers as a group continue to slip in the rankings, which are based on a survey of 451 suppliers covering 17 working-relationship variables. The report until this year has included only the three U.S. domestics and the Big Three Japanese automakers. Planning Perspectives notes that while Europe's three largest automakers (BMW, Mercedes-Benz, and Volkswagen) were included in the survey, they are not part of the "official" report because there is no historical data with which to properly explain trends. Behind the leaders were, in order, Ford, Nissan, General Motors, and Chrysler. Chrysler has made significant improvements for the past two years, the report noted.