Definition: A classification method in which the individual pieces exist without rank, or level.
Also referenced as: Heterarchical (adjective)
Related to: Hierarchy, Pattern, Relationship, Sitemap, Taxonomy
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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.
A narrow and deep hierarchy gives the user fewer choices at once. On a large website, like usa.gov, a few high level options point users to more specific items with each click.
When individual pieces exist on one level without further categorization, the taxonomy is heterarchical. For example, each lettered box in the arrangement in this illustration is heterarchical.
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We use hypertext to connect things without necessarily placing them together.
Hypertexts are fundamentally different from hierarchical, heterarchical, and sequential taxonomies, because they don’t change where things are located, just how they’re found.
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 signpost directing you to a store around the corner is also hypertextual, because it sends you to a specific location without changing the location of the store.
Similarly, websites use hypertext to link to content without needing to repeat it.
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The world is organized in seemingly endless ways, but in reality, every form can be broken down into some taxonomic patterns.
Hierarchy, heterarchy, sequence, and hypertext are just a few common patterns. Most forms involve more than one of these.
A typical website has a hierarchical navigation system, a sequence for signing up or interacting with content, and hypertext links to related content.
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.
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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.
Try structuring the mess with common patterns of boxes and arrows as shown on the next page. Remember that you’ll probably need to combine more than one pattern to find a structure that works.