This extension allows the creation of a hierarchical page navigation structure. It is not intended to structure the contents of a whole wiki like the Treeview skin. Instead, it is suited to create hierarchical sets of pages within a web-like wiki. Possible applications are tutorials and reference manuals. Homepage: http://www.mediawiki.org/wiki/Extension:Hierarchy Introduction: There are three main forms to organize content on a web site: webs, sequences and hierarchies. A web is the most common organization form for a wiki. In this structure, pages have many free links among them. This format is well-suited for pages that are loosely related, such as encyclopedic entries. In a sequence, pages are organized in a sequential form. One page leads to the next. This structure is appropriate for tutorials and presentations. A more structured form is the hierarchy. It is useful when there is a natural classification of the content that makes navigation more intuitive. It could be used, for instance, for a product reference manual. MediaWiki excels at the web structure. It can also be used to represent hierarchies, using internal links and subcategories. But sometimes it is useful that, in addition to the web structure, the user is presented with some guidance that will help him to have a global vision of an information body and to achieve an easier navigation. The Hierarchy Extension can be used to create sequential and hierarchical structures.