From That case, How have GM’s strategy, structure, and decision-making processe

From That case,
How have GM’s strategy, structure, and decision-making processes evolved overtime?
How well aligned were they in each of the three major eras ?
what are the distinctive challenges of managis a matrix organization like GM ?
How has GM Chose to address these challenges ?
on the page 15 last paragraph :
We have come a long way as a team. But are we ready to manage the complexities of holding the regions president accountable for business results when they are no longer autonomous business units, with their own product portfolio or product development/engineering staff? How are we going to ensure that GM acts like one company, leverages its capabilities in local markets, and win the race to the middle ?