Definition: A classification method that applies successive ranks and levels.
Also referenced as: Hierarchical (adjective) Hierarchy diagram (noun) Hierarchically (adverb) Hierarchies (noun) Hierarchy Diagram (noun)
The word hierarchy was used 19 times across 8 pages
These concepts don't necessarily live under an established hierarchy or sequence. For example, in the diagram above, I've outlined the various aspects of running a pizza parlor as the owner (me!) might think about them.
When taxonomies are arranged hierarchically, it means that successive categories, ranks, grades, or interrelated levels are being used. In a hierarchy, a user would have to select a labeled grouping to find things within it. A hierarchy of movies might look like this:
Hierarchies tend to follow two patterns. First, a broad and shallow hierarchy gives the user more choices up front so they can get to everything in a few steps. As an example, in a grocery store, you choose an aisle, and each aisle has certain arrangement of products, but that's as deep as you can go.
We use hyperlinks to allow users to jump between taxonomies instead of duplicating or moving content. For example, we might hyperlink the bolded words throughout this book. If a user clicks on one of them, we could take them to a definition in the lexicon. We're moving the user to the content instead of repeating it.
A typical grocery store has a hierarchical aisle system, a heterarchical database for the clerk to retrieve product information by scanning a barcode, and sequences for checking out and other basic customer service tasks. I was even in a grocery store recently where each cart had a list of the aisle locations of the 25 most common products. A great use of hypertext.
A typical book has a sequence-based narrative, a hierarchical table of contents, and a set of facets allowing it to be retrieved with either the Dewey Decimal system at a library, or within a genre-based hierarchical system used in bookstores and websites like Amazon.com.
Because your structure may change a hundred times before you finish making it, you can save time and frustration by thinking with boxes and arrows before making real changes. Boxes and arrows are easier to move around than the other materials we work with, so start there.
For example, let's say we're working on bringing a product to the market. To support this process, we might create:
These are all important pieces individually, but we need to look at them together to answer questions about the whole such as: