This paper respectively introduces set-valued information systems and interval-valued information systems, and
presents interval and set-valued information systems which have common features of above two systems. According to
the semantic relation of attribute values, interval and set-valued information systems can be classified into two categories,
disjunctive( type I ) and conjunctive( type II ) systems. Then, a dominance-based rough set model is presented for these
two types of interval and set-valued information systems, and some related properties are discussed. Finally, the results of
practical examples show the effectiveness of the proposed system.