In 2002, the National Construction Safety Team Act mandated NIST to conduct an investigation into the collapse of the World Trade Center buildings 1 and 2 and the 47-story 7 World Trade Center.
2002年国家建筑安全小组法案授权NIST对世界贸易中心1号楼和2号楼以及47层高的世界贸易中心七号楼的倒塌进行调查。