Abstract: A visualization and navigation technology for complex data sets supports interactive engagement which can result in changes of data in the data sets is suitable for applications providing discussion platforms. A sequence of representations of the node-link structure is presented on a display. Each representation in the sequence includes an upper-level node feature such as a wheel-like construct, intermediate-level node features, and lower-level node features. The upper-level node feature includes a rim. The intermediate-level node features and lower-level node features are positioned on the display along the rim. The lower-level node features and intermediate-level node features are positioned in groups along the rim according to a source parameter. Pointer activated functions are included which cause changes in the representations. A pane for presenting content can be included and linked with the wheel-like construct.