The note below is from Joe Salvo, who is a very active member of the Census Bureau State Data Center (SDC) network, but not a CTPP listserv member: We have taken a close look at the counts of total workers from the 1990 and 2000 CTPP Part 2 at the Census Tract level. There seems to be an unusual amount of volatility, with double-digit percent increases and declines. (And, it is not a function of small bases, as many of the tracts showing large increases/declines have several thousand workers.) We have mapped the changes and, with the exception of two or three areas, these "ups and downs" seem almost randomly distributed. Has anyone else compared 1990 and 2000 CTPP data for small areas? Joe Salvo NYC Department of City Planning jsalvo(a)planning.nyc.gov