The Discovery - Visualisation Interface (DVI) generates a graph representing the data and discoveries. This contains a node for each rule and each item of data to be visualised. Links between nodes represent relationships between them.
In the specific case of the classification rules, the right hand side of rules and classifying attribute of data are not used in the link creation process, but solely to colour the nodes allowing misclassifications of the data to be seen.
There are three types of link used in the visualisation; rule-rule links, rule-data links and data-data links. Rule-rule links are uniformly large repulsive links between every pair of rules. Their purpose is to separate the different rules. Rule-data links are small attractive links whose strength reflects the degree of match between rules and data. Data-data links are attractive or repulsive and their strength reflects the degree of similarity between data nodes. They used to generate clustering in the data. To reduce the number of links, and improve visualisation, small rule-data and data-data links are pruned using user defined thresholds.