November 28, 2001
Lately I've been hearing a lot about Faceted Classification. I'm not sure who was the first to coin it but it's a navigation method that seems to work very well when you have a large list of items you need to classify and browse.
Here are some examples of sites that use Facetted Classification:
WHAT IS IT?
Yahoo's Dewey Decimal System approach of highly coordinated taxonomy has a tree structure where each item has a small pigeon hole at the end where the item is classified. Of course any given item can be put into multiple boxes, but in the end it's a dead-end system where you have to climb up the branch again to browse further. This may be suitable if you have a small number of categories, but quickly becomes unweildly and a maintenance nightmare when you have as many items as Yahoo or any decent sized ecommerce site.
In the case of Epicurious the issue is how to classify all the recipes on the site in a way that is easily browsable while at the same time usable. They achieve this by using a facetted approach. Each receipe is given four attibutes (= facets = metadata) - Main Ingredient, Course / Meal,Cuisine, Season/Occasion. (see example) Since each recipe has these facets the search can be refined by each time by one of these facets. You can start on any facet and refine by any facet. It become a very "open-ended" browsing method. This systems also lends itself to easy maintenance and excellent cross referencing.
Facet | # of Terms
- make sure that you have too many items to be listed in a clear tree hierarchical list
WORDS OF CAUTION
If you have items that are not readily categorizable or the categories are disputed, this may not be the system to use. Recipes and wines are one thing, assigning attributes to articles produced by an organization may be harder to implement.
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