Abstract: There is provided a method of displaying data including data items, the method including: creating a first visual presentation format for the data, wherein the first format is a non-linear hierarchical format formed by a nodal tree structure including nodes each associated with a hierarchy, with a central node and sub-nodes branching off from the central node or from a respective sub-node of a higher hierarchy, wherein each node represents one of the data items, and at least some of the data items are associated with numerical information; creating a second visual presentation format for the data, wherein the data items are arranged along a scale in accordance with the numerical information associated with at least some of the data items; and displaying the data in the first or second format.