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Distribution has become a fundamental requirement for information systems and not an auxiliary. We believe it is important to consider distribution from early stages of the life cycle of software development and deal with distribution at a high abstraction level. This paper, presents a conceptual model for specifying software architectures of distributed information systems. The conceptual model is defined by combining the aspect-oriented software development (AOSD) and the component-based software development (CBSD). The distribution conceptual model is explained by presenting its AOSD perspective and the CBSD perspective. The AOSD perspective of the conceptual model describes the mobile and replication behaviour of an architectural element by introducing a distribution aspect and a replication aspect. The architectural perspective (CBSD perspective) of the distribution model allows specification of the distributed communication of the architectural elements of a software architecture.