1. Automobile: From 1985 Ward's Automotive Yearbook
2. University: Data in original (LISP-readable) form
3. Flags: From Collins Gem Guide to Flags, 1986
4. Pittsburgh Bridges: Bridges database that has original and numeric-discretized datasets
5. Housing: Taken from StatLib library
6. Meta-data: Meta-Data was used in order to give advice about which classification method is appropriate for a particular dataset (taken from results of Statlog project).