Paper's title: Pattern Systems for Hypermedia Author's names: Alejandra Garrido, Gustavo Rossi and Daniel Schwabe E-mail address: garrido@sol.info.unlp.edu.ar Postal address: 50 y 115, 1er. piso, CP 1900, La Plata, Buenos Aires, Argentina. Phone number: +54 21 228252 Abstract: The hypermedia domain is currently receiving much attention, mostly due to the new generation of open systems, i.e., those that allow the connection among applications in the same or different machines (intranets) or those that publish the interface of an application in a WWW's browser. However, current applications in this domain are not taking profit of all benefits that characterize hypermedia applications, and maintenance is very difficult to achieve. Building large hypermedia applications is a hard task, and although there exist many hypermedia design methodologies we also need design patterns that convey the expertise in the domain. We present in this paper three pattern systems intended to provide guidance for different aspects of hypermedia applications; the first one concerns with the development of software support for hypermedia in the context of OO applciations; the second one deals with organizing the navigational structures in a clear and meaningful way for intended readers and the third one gives some guidelines for building an effective interface. The subject area of the paper: hypermedia design Keywords: Hypermedia systems, Hypermedia navigational design, Hypermedia interface design.