1. A method for invariant representation of computer network information technology (IT) managed resources, comprising: defining a common information model for representing the managed resources; receiving an identification of a resource managed by an IT resource management point product, the identification including an identification of a representation used by the point product for the resource managed by the point product; determining if an invariant representation for the resource managed by the point product has previously been defined under the common information model; associating the representation used by the point product for the resource managed by the point product with the previously defined invariant representation for the resource managed by the point product when an invariant representation for resource managed by the point product has been previously defined; and defining a new invariant representation for the resource managed by the point product and associating the representation used by the point product for the resource managed by the point product with the new invariant representation when an invariant representation for resource managed by the point product has not been previously defined, wherein the new invariant representation is a unique representation under the common information model.