The structure of a thesaurus is hierarchical. Each term within the hierarchy lists related terms.

A type of data storage structure that links data in a tree-like fashion. Knowledge about these data is dependent on the data structure.

An organizational style of reporting relationship where each person or group reports to a more senior person or group of individuals. The style usually resembles a pyramid with the most senior person at the apex (top) of the pyramid.

A treelike branching structure where each component has only one owner or higher level component. A 1:N structure.