Abstract: A method for selecting a method for categorizing a collection of content data files from among a plurality of categorization methods, the method comprising the steps of identifying a collection of content data files, each content data file comprising image or audio data, determining a number of groups (G1) of content data files that will be generated when a first categorization method is applied to the collection of content data files; and designating a range of representations (R) that can be presented on the display, each representing a group of content data files. A first categorization method is selected when the number of groups G is within the range of representations (R); and a different categorization method is selected when the number of groups (G1) is not within range (R).