One of the advantages of the prevailing model of faceted filtering on the web is the display of magnitude, or the size of the resulting set of items after selecting a filter value. You’ve seen this already: I’m talking about the numbers next to filter labels. This let’s you know how many things you’re going to get if you select that option.

While these calculations may be performance intensive, indication of magnitude provides valuable navigational cues to users. Seemingly trivial, this tiny bit of information can affect a user’s decision to select a filter or not. This post reviews approaches to showing magnitude in faceted navigation.

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