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This paper presents the work done in project OWLA for a development methodology, focusing on Web-based and mobile-aware, open and adaptive hypermedia information systems. As the existing development methodologies do not support the additional requirements for adaptivity, such as personalization, and mobile-use, new methods for designing are proposed. Openness (related to interoperability) and the Internet-environment present challenges for security, which is part of the overall methodology as well. By addressing these aspects (mobility, adaptivity and security), the methodology fragments are meant to complement the existing approaches for designing hypermedia and information systems. Preliminary experiences of our approach are consired.