The fifth step is to calculate the distribution ratio of the activity driver and distribute the activity cost to different objects of cost calculation.

计算作业动因分配率，将作业成本分配至不同的成本计算对象。

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Any activity that distracts a driver should be illegal, be it texting or an animal on their lap.

WSJ: Bill to Ban Lap Dogs Unleashes Fight

Investment activity was the principal driver of fluctuations in the silver price in 2011, said the World Silver Survey.

FORBES: Silver Survey: Investment Key To Silver-Price Action In 2011; Mine Supply Hits Record High

Politics was a major driver of activity on Twitter in 2012, a sign not only that Twitter users do not shy away from talking politics on the platform, but that they relish the opportunity to do so.

FORBES: Politics Dominate Twitter's Year In Review