Monthly report for February 2001 by Christian A. Hummel: Hummel traveled to Flagstaff to attend the quarterly meeting of NPOI, where he presented a brief summary of the current state of the astrometry and led a discussion on common data formats and software. Hummel helped with the LDL pipe cleaning and installation efforts while in Flagstaff. Hummel installed the NPOI data reduction software at Lowell in preparation of the upcoming Michelson Summer School meeting. Hummel discussed this meeting with Jeff Hall while at Lowell. Hummel refereed papers for the Astrophysical Journal and Astronomische Nachrichten.