Information Visualisation (InfoVis) is defined as the interactive visual representation of abstract data. We view the end-users’ interaction with InfoVis tools as a learning experience which is made up of a set of highly demanding cognitive activities. These activities assist the end-user in making sense and gaining knowledge of the represented domain. There is a consensus in the InfoVis community about the importance of user evaluation studies in measuring the effectiveness of InfoVis tools. However, usability studies, which are most commonly used in this domain, are not appropriate for capturing the end-user cognitive processes that occur during the learning experience. To address this issue this paper discusses work in progress in developing a cognitive based framework for evaluating the effectiveness of InfoVis tools on the user learning process, by employing metrics for measuring the peoples ability to remember, understand, analyse, and derive insights from the visualised data, applied in the Cultural Heritage domain.