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In some hypermedia system applications, like interactive digital TV applications, authoring and presentation of documents may have to be done concomitantly. This is the case of live programs, where not only some contents are not known a priori, but also some temporal and spatial relationships, among program media objects, may have to be established after the unknown content definition. This paper proposes a method for hypermedia document live editing, preserving not only the presentation semantics but also the logical structure semantics defined by an author. To validate this proposal, an implementation has been done for the Brazilian Digital TV System, which is also presented.

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The adoption of collaborative learning techniques for software engineering education provides the opportunity for discussing software modeling issues considering multiple points of view. As a consequence, students are expected to develop better models for software problems. To do so, it is necessary to develop or adapt tools that support teachers and students when adopting this approach. This paper describes a study on the use of the Collaborative Learning Peer Review technique in a System Modeling courses. As a result, we have a set of requirements for a tool to support this technique for teaching modeling software with UML (Unified Modeling Language).

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