 Not all versions of the DIKW model reference all four components (earlier versions not including data, later versions omitting or downplaying wisdom), and some include additional components.In addition to a hierarchy and a pyramid, the DIKW model has also been characterized as a chain, as a framework, as a series of graphs, and as a continuum.Danny P. Wallace, a professor of library and information science, explained that the origin of the DIKW pyramid is uncertain