• Tree maps: A tool for structuring, exploring and summarising qualitative information

    This tool makes use of qualitative information that is in the form of important distinctions or differences that people see in the world around them.
  • Hierarchical card sorting

    Hierarchical card sorting (HCS) is a participatory card sorting method designed to provide insight into how people categorise and rank different phenomena.
  • Malawi exports treemap

    This Wikipedia page is an example of an export trading treemap developed by the Observatory of Economic Complexity of MIT Media Lab and the Center for International Development at Harvard University.