This thesis describes and analyzes implications of going from hypertext news to hypermedia news through a process of design, involving users and producers. As in any product development, it is difficult to conceive design of a novel news format that does not relate to earlier genres, and thus to antecedent designs. The hypothesis is that this problem can be addressed by explicitly taking a genre perspective to guide interaction design. This thesis draws on genre theory, which has previously been used in rhetoric, literature, and information systems. It is also informed by theories from humancomputer interaction. The methodological approach is a case study of the ELIN project, in which new tools for online hypermedia newspaper production were developed and integrated. The study follows the project from concept design to interaction design and implementation of user interfaces, over three years. The thesis makes three contributions. Firstly, a genre perspective on interaction design is described, revealing broadly in what respects genre affects design. Secondly, the online newspaper genre is described. Based on a content analysis of online newspaper front-pages, and interviews with users and producers, genre specific design recommendations regarding hypertext news front-page design are given. A content analysis of Swedish online newspapers provides a basis for a design rationale of the context stream element, which is an important part of the news context on article pages. Regarding hypervideo news, design rationale is given for the presentation of hypervideo links, in the context of a hypermedia news site. The impact on news production in terms of dynamics of convergence is also discussed. Thirdly, the design processes in cooperative scenario building workshops are evaluated, regarding how the users and producers were able to contribute. It provides implications and lessons learned for the workshop phase model. A discourse analysis also reveals important facilitator skills and how participants relied on genre in the design process.