Can embracing the customer with Build-to-Order (BTO) cure the auto industry's chronic lack of profits? That's one of the questions posed by a new MIT study that follows the early 1990s' study of lean production methods summarised in the book, 'The machine that changed the world'. But some makers remain stubbornly wedded to the old ways and it's not just the usual suspects. Neil Winton speaks to the authors of 'The Second Century'.