108 Chapter 5: Consistency n n Follow an up-and-down model The classification process starts in the middle, from the prototypical categories, grouping them in supercategories and then splitting them in subordinate, more specific categories. Prototypicality works within a hierarchy as well so that middle-classes are usually more representative of the whole tree. Make base categories easily accessible Users should be able to reach base-level categories as quickly as possible. It's entirely possible that popular tags in folksonomies identify prototypes. Case stUdies a taxonomy for snoopy A very interesting case study was made public in 2003 by Katherine Bertolucci. In Happiness Is Taxonomy--A Classification for Snoopy she recounts her expe- rience in building the new catalog and related complete new taxonomy for Determined Productions, the largest Peanuts toys company on the market