Abstract: A converged Operations Support System (OSS) for managing a hierarchical network environment including a plurality of network domains. In one embodiment, each OSS component of the OSS is mapped against a particular hierarchical information layer of a plurality of hierarchical information layers required to manage the hierarchical network environment. When a query is received at a northbound interface of the OSS from an external requester, a determination is made as to which particular hierarchical information layers are required to generate a response to the query. Responsive to the determination, the query may be forwarded to one or more OSS components mapped to the particular hierarchical information layers for generating a response.