Piggy Bank allows the user to tag each information item with several keywords, thereby fitting it simultaneously into several organizational schemes. For example, a photograph can be tagged both as “sepia” and “portrait”, as it fits into both the “effect” organizational scheme (among “black & white,” “vivid,” etc.) and the “topic” scheme (among “landscape,” “still life,” etc.). Tagging has been explored previously as an alternative to folder hierarchies, which incur an over- head in creation and maintenance as well as disallow the co-existence of several organizational schemes on the same data ([37, 38, 42]). We support tagging through typing with dropdown completion.
