1. Car Evaluation: Derived from simple hierarchical decision model, this database may be useful for testing constructive induction and structure discovery methods.
2. Lenses: Database for fitting contact lenses
3. MONK's Problems: A set of three artificial domains over the same attribute space; Used to test a wide range of induction algorithms
4. Teaching Assistant Evaluation: The data consist of evaluations of teaching performance; scores are "low", "medium", or "high"