Lead times: Procurement managers have to account for manufacturing times plus shipping times when importing from China, compared to a location in the U.S. or Latin America, for example. Single sourcing from China was not the only risk; single sourcing from any one region was a risk. Some members of Sourcing Industry Group thought they had diversified by adding a supplier in Vietnam, only to find out that supplier was buying materials and components from the same spot as the vendor in China, Tiura said.