Martha: Yes, the TAZ boundaries from the Census Bureau's web site are "generalized" boundaries, intended for mapping at a very small scale, say, 1:1000000. Where TAZ boundaries tend to zig-zag, the Bureau has removed both the zig and the zag. Again, this is OK for mapping at very small scales, but could be a problem when zooming into a particular county or community. The accurate boundaries can be derived from TIGER/Line files, and won't have the generalizations and "smoothing out" of boundaries. You can get these from ESRI's web site at: http://www.esri.com/data/download/census2000_tigerline/index.html (Note: the link from geographynetwork.com now points to this ESRI page.) Chuck Purvis, MTC Has anyone had problems using the shape files or E00 files for TAZ boundaries available on the Census website? We have noticed that some of our TAZ boundaries look strange, as if there is a problem with collapsing polygons. Do I need to create the TAZ boundaries myself from the TIGER files? Any guidance on this would be greatly appreciated.