As manufacturers discover that lean can bring improvements in processes away from the shop floor, service industries are adopting lean principles, too. Ron Wince traces the migration. What does Toyota have in common with the Johns Hopkins Medical System, Wells Fargo, and General Electric? More than you might thinkÔÇöthe last three are a part of a growing trend of service companies who are . . . . . . adopting the tools that have made Toyota arguably the best automotive manufacturer in the world.