Some of the important best practices for designing filters for faceted search results are:
- Decide on your filter value-selection paradigm—either drill-down or parallel selection
- Provide an obvious and consistent way to undo filter selection
- Always make all filters easily available
- At every step in the search workflow, display only filter values that correspond to the available items, or inventory
- Provide filter values that encompass all items, or the complete inventory
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