Auto workers, represented by the United Auto Workers (UAW), have been making several demands during contract negotiations with Detroits Big Three automakers, which have led to strikes. Here are some of the demands:

• Pay increases and cost of living adjustments: The UAW is asking for a 36% pay increase across a four-year contract. The union started out demanding a 40% raise in wages over four years, and has come down to 36% . They also want regular cost-of-living adjustments to wages to protect against inflation, a benefit the workers lost in 2009.

• 32-hour workweek: The UAW is demanding a 32-hour workweek (with pay for 40 hours) .

• Elimination of pay tiers: Striking autoworkers want to be paid more equally, setting their sights on a staggered wage system that they say is unfair. The UAW is demanding an end to a tiered system of employment that leaves newer workers on a lower wage scale, with lesser benefits.

• Representation of workers at electric vehicle battery factories: The UAW wants to represent workers at 10 electric vehicle battery factories, most of which are being built by joint ventures between automakers and South Korean battery makers. The union wants those plants to receive top UAW wages.

• Limitation of temporary workers: The union is demanding that the automakers limit their use of temporary workers, who under the tiered-wage system receive the least pay and no benefits.

• Retiree health care: The UAW is demanding that the automakers continue to provide retiree health care.

The demands vary slightly depending on the source, but the common themes are pay increases, elimination of pay tiers, and representation of workers at electric vehicle battery factories.