This dataset provides eight feature classes. The base feature class is called CensusTracts_tr and isn't generalized. The weighted centroids feature class is called CensusTracts_tr_cent. The centroids are weighted by the U.S. Block Centroids population distribution. Use the weighted centroids in report aggregation and spatial overlay operations. The CensusTracts_tr and CensusTracts_tr_cent feature classes contain all the attributes. There are six generalized boundaries feature classes and called: CensusTracts_tr_gen2, CensusTracts_tr_gen3, CensusTracts_tr_gen4, CensusTracts_tr_gen5, CensusTracts_tr_gen6 and CensusTracts_tr_gen7. Use the generalized boundaries when creating study areas.