Abstract: In group decision-making theory, how to acctuire reasonable decision rules is an important issue. This paper constructed a dominance relation-based variable precision rough set model (VPRSM) in fuzzy objective information systerns, and proposed some knowledge reduction definitions such as dominanc-based lower/upper distribution reduction.Using a heuristic function, we devised a lower distribution reduction algorithm. Finally, this model was applied to computer audit risk appraisal and some reasonable appraisal rules were acquired.

Key words: VPRSM, Dominance relation, Uroup decision-making, Computer audit risk