Replaces everything after the enacting clause. Reinserts the provisions of the introduced bill. Provides that the Department of Revenue may determine the scope of the historical data necessary to complete the study, but in no event shall the scope or time period be less than the 10 most recent tax years for which the Department has complete data. Provides that the study need not be limited to certain specified factors. Removes provisions from the introduced bill providing that the study shall include an analysis of the use of technology in data collection. Provides that the Department of Revenue may (in the introduced bill, shall) consult with Illinois institutions of higher education in conducting the study. Provides that the Department of Revenue may also consult with units of local government. Makes other changes.