Companies are continually fnding new ways to get the right goods to the right customers at the right time, and have developed many metrics to measure their performance in these areas. Most of these metrics show distribution productivity and accuracy are improving over time, which keeps raising the bar for service levels. For example, from 2007 to 2008, companies reduced their average days on hand of fnished goods inventory from 35 days to 28, reduced dock-to-dock cycle time by 2.5 hours, and reduced days of sales outstanding from 40 days to 35, all while maintaining 98 percent fll rates, according to the Annual Warehouse Benchmarking studies conducted by the Warehouse Education and Research Council (WERC) and DC Velocity.