Grid environment is a service oriented infrastructure in which many
heterogeneous resources participate to provide the high performance
computation. One of the bug issues in the grid environment is the vagueness and
uncertainty between advertised resources and requested resources. Furthermore,
in an environment such as grid dynamicity is considered as a crucial issue
which must be dealt with. Classical rough set have been used to deal with the
uncertainty and vagueness. But it can just be used on the static systems and
can not support dynamicity in a system.