A hypermedia system for interactive problem solving in arithmetic

This paper describes ARI-LAB, a system that combines hypermedia and network communication technologies in order to assist pupils in arithmetic problem solving. The theoretical framework and the a priori analysis that have inspired the design of the system are reported with regard both to cognitive and educational aspects. The main features of ARI-LAB are presented and the innovative aspects that in our opinion characterise it are pointed out. Software engineering and user interface chioces are discussed with particular reference to hypermedia and human-computer interaction research. Moreover, the first evaluation of the system, which was carried out with four deaf children of primary school, is presented and some findings are discussed.