Abstract: A selection system, including: (a) a user interface for use in selecting an item, the user interface being served to and stored on a user device only for the duration of a session, and for providing categories, selection criteria and item data selectable using the device; and (b) a server component for serving the user interface for the session, for serving only category data during the session, in response to selection of one of the categories when the category is not a leaf category, to change the categories provided by the user interface, and for serving only selection criteria and item data during the session in response to selection of a leaf category of the categories.