Abstract: Software agents are becoming an important design paradigm for inter-operating open, distributed systems. Mobile agents and intelligent agents are obviously different in origins, emphases, implementation and application platforms and interests of the supporting communities. But both mobile agents and intelligent agents paradigms are targeting adaptive and flexible co-operation, particularly for interoperability between or within distributed systems in a dynamically changing environment. In this paper, the similarities and differences, advantages and disadvantages of the OMG mobile agent and FIPA intelligent agent approaches in specific application context are analyzed. Based on the analysis, two ACL based possibilities are discussed for harmonizing and integrating the two standards and a MASIF-FIPA addon is also developed.