On June 29, 2011, the National Institute of Standards and Technology (NIST) announced that it would conduct a technical investigation of the tornado that struck Joplin, MO, on May 22, 2011. In November 2011, NIST released a draft plan for the study and briefed the National Construction Safety Team (NCST) Advisory Committee on the progress of the investigation in a meeting that was open to the public. The final investigation plan, released in May 2012, can be found at http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911000
. This report summarizes the progress NIST has made and the cooperation it has received from a variety of organizations in conducting the study.