The aggregated search assembles in one interface information from different sources. It deals with different types of content (text, video, image, etc) and granularities of retrieval. It aims to assemble the retrieved content forming an aggregated result. This is in contrast with the common approach which provides a list of documents as the search result. Today we are able to retrieve content of different types and granularities, but little work has been done for their aggregation. Being a new area of research formalization of aggregated s still missing. This paper treats the problem in a high level of abstraction. It presents the state of the art and decomposes the problem, listing issues and providing examples and formalization. This work aims to be a base of reflection and a reference for future work. R