The paper presents an empirical research whose goal is to study the interaction between a Case-Based Reasoning (CBR) system and users without knowledge of CBR. This interaction, that here is called CBR naïve interaction, can occur frequently in web-based CBR systems and consequently in CBR-based e-commerce systems. The research was led during the usability assessment of COOL-TOUR a web-based CBR system for tourist culture support. The paper describes methods and results of the usability tests as well as a preliminary experiment. The quantitative results are not final but qualitative evidence suggests that the user adopts different models of interaction.
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