1. A method for performing systems management on IT-resources using web services, wherein said resources are managed in a computational network within a plurality of runtime environments having different respective instrumentations, wherein a resource configuration database is provided for storing a collection of resource-specific data on said IT-resources, comprising by the steps of: at runtime of a systems management operation directed to a predetermined IT-resource, using a stateless, first generic web service for requesting descriptive information on said IT resource from respective entries of said configuration database, wherein said descriptive information includes an enumeration of resource types said predetermined resource belongs to, selecting a specific one of said resource types from a response of said first generic web service, using a second generic web service for requesting meta data describing different resource instances currently existing in the network for said selected resource type, selecting a specific one of said resource instances from a response of said second generic web service, using said second generic web service for requesting meta data describing properties of said preselected resource instance and/or operations currently validly operable at said preselected resource instance for performing a systems management operation on said selected resource instance or for performing an access to said selected resource instance.