Modern organizations become dist ributed and maintain multiple iden tity repositories. This reality promotes spreading identity attributes across inform ation systems and landscaping identity silos. Many security use cases require identity silos consolidation that can be set through identity aggregation. In this paper, we explain within identi ty management parlance and compare between attributes aggregation conceptual models: meta-centralization, virtual-centralization, and identity federation. We propose also a framework would help organizations to conduct implementation projects of attributes aggregation. A great attention should be paid simultaneously to strategic purpose, aggregation models, architectures, and implementations.