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html. The interface uses four tabs: The Navigate tab implementing the graphical shopping interface (GSI), the Direct Search tab implementing the graphical recommender system (GRS) [23], a Preferences tab to set weights, and a Saved Products tab to save products in.The graphical recommender system creates a map of products given a search query. The represented products are those most similar to the query. Representing these results in a map instead of, as is usually done, a list has the advantage that it makes clear which search results are similar to each other and which differ from the query on a different set of attributes.In both the GSI and GRS map, products are represented by a thumbnail picture. By clicking, products can be selected and detailed information is shown right from the map. Above the map in the GSI tab, there are some buttons to go to the next iteration, to go one iteration back, to restart the process, and to save a product. In the Preferences tab the user can set the weights used to compute dissimilarity in the GRS and GSI. Also, the user can deselect certain attributes, which means that their weights are set to 0. When weights are changed, the maps are immediately adapted. This tab also has a ‘smart weights’ button which can be used to set the weights to the values determined using the approach discussed in Section 17.4. Hence, the weights are then set to the the values shown in Table 17.3.
There is a smooth transition between two steps in the GSI. After the selection of a product by the user, the new products are added to the map at random positions. Then, the map is optimized using MDS. The optimization process is shown to the user. When the optimization has converged, the old products are gradually made less important (using the weighted version of MDS) until their influence is zero. Finally, the old products are removed from the map and the new map is optimized. This implementation yields smooth visual transitions, which are important for an effective GUI.
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