The ability to collaboratively edit work artefacts is important in many kinds of editing tools, including Computer-Aided Design (CAD) tools, Computer-Aided Software Engineering (CASE) tools, drawing packages, and document editors. However, most existing such tools either do not support collaborative editing or provide limited collaborative editing facilities. We describe our recent work in addi...

Collaborative-filtering-enabled Web sites that recommend books, CDs, movies, and so on, have become very popular on the Internet. Such sites recommend items to a user on the basis of the opinions of other users with similar tastes. In this paper, we discuss an approach to collaborative filtering based on the Simple Bayesian Classifier, and apply our model to two variants of the collaborative fi...

In this work we present a thread-based approach for analyzing synchronous collaborative math problem solving activities. Thread information is shown to be an important resource for analyzing collaborative activities, especially for conducting sequential analysis of interaction among participants of a small group. We propose a computational model based on thread information which allows us to id...

Collaborative learning involves small groups of students working together to solve problems for the purpose of learning. There are a large number of researches that focus on the technical aspects of computer-mediated environments for collaborative learning. Very few studies have examined the design of Web 2.0 technologies to support collaborative learning using an activity-oriented approach. In...

The Collaborative Process-Centered Environment project (CPCE) aims at applying process modeling approach and technology to a given class of collaborative applications. The challenge is to deal with ne grain entities and interactions, and to provide the high level of adaptability and controlled exibility required by real world collaborative situations. The concept of a collaborative meta process...

In this paper, first we examine the usual treatment of temporal information and we recall the main features relative to the temporality analysis in texts. Then we deal with the formal representation of calendar expressions, and we provide a functional approach, based on a categorical representation of ordinals. Finally, an ongoing application providing a help for the reading of long biography i...

Modern development of huge ontologies in domain of crucial importance is inconceivable without appropriate means for effective collaboration between knowledge stakeholders. The paper presents an approach for collaborative ontology development using inheritance of classes and their properties, relations and metadata. Collaborative actions for maintenance of ontology content are supported by a sp...

We discuss an approach to collaborative data management based on uncertain databases. Note that, in a collaborative data management system, users may have contradicting opinions about the correct values of data items. In our approach, we propose to store all conflicting data versions in parallel and to resolve conflicts based on user ratings. We show that such a collaborative data management sy...