Abstract: In the timing information system, although the general algorithm of rules access based on rough set can generate all possible rules, there are usually some set of rules which have phenomenon of coverage. The removal of redundant rules from the set of rules is very time-consuming and not practical. This paper presents an improved strategy of rules access to directly access the smallest set of rules with analysis of specific examples to verify effectiveness of the proposed strategy.

Key words: rough set, timing information systems, decision-making rules