Performance metrics for warehouses and distribution centers have steadily improved since 2003, when the Warehousing Education and Research Council first conducted its annual "DC Measures" study, says Joe Tillman, senior researcher at Supply Chain Visions and co-author of the study.  Moreover, the gap has significantly narrowed between best-in-class companies and those lower on the performance scale.  Tilman discusses the implications of these and other results of the latest "DC Measures" study. [Run Time (Min.): 10:05]