Problem: Customers use layered navigation to filter to their desired product, but if the user selects a configurable products from the category, they must select the same options again to configure the product before getting the associated simple product.
Solution: Use the options selected in the layered navigation filters to pre-select configurable product options.
Example: A category of Shoes (configurable product) has layered navigation filters for Size, Color, etc. In the category, a user selects filter attributes for Size10 and ColorRed to find the products with Red, Size 10 shoes. As Magento is now, the user clicks on their desired shoe to go to the configurable product page and must then select the attributes again to configure their product. We could skip this step by using the Size10 and ColorRed filtered attributes to pre-select those same attributes on the configurable product page.