GM on Tuesday introduced what it calls "Work Appropriately" to its global workforce of 155,000 employees. Work Appropriately is not a policy, GM insists. It is a mindset, a culture shift that gives many salaried workers more flexibility to work remotely or come into the office if necessary to best perform their jobs. It is a tipping point that will likely change GM's footprint in Southeast Michigan, though to what extent remains unknown. The automaker may see fewer people inside its world headquarters in Detroit's Renaissance Center on a daily basis, for example, and individual desks will give way to community work spaces.