Changes and adaptations are always necessary after the deployment of a multiagent system (MAS), as well as of any other type of software systems. Some of these changes may be simply perfective and have local impact only. However, adaptive changes to meet changed situations in the operational environment of the MAS may have global impact on the overall design. In this paper we analyze the issue of continuous design change/adaptation in a MAS organization, and the specific problem of how to properly model/design a MAS so as to make it ready to adaptation. Special attention is paid to the Gaia methodology, whose suitability in dealing with adaptive MAS organization is discussed also with the help of an illustrative application example and analyzed in comparison with a number of different methodologies.