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This paper describes a novel application of enhanced visual programming and visualisation techniques to support data mining processes on the Internet. While the idea of using visual languages to support data mining has been proven to be useful, the usability of existing implementations has been limited. Here, we consider the issue of usability of data mining via the Internet. We also present "interactive visual programming", a method which automates the construction of a visual program through a direct manipulation interface and visualisation. We also illustrate new techniques for data and model visualisation that can aid the understanding of data and models.