1. A computer-implemented method of obtaining criterion-specific feedback for an item, comprising: providing for display information for the item, the information including a user-selectable feedback element for providing feedback for the item; in response to receiving a selection of the user-selectable feedback element, providing for display a set of user-selectable existing criteria relating to the item, a set of user-selectable existing values for each existing criterion, and a user-selectable add feedback element for providing additional feedback for the item; receiving a selection of the add feedback element when none of the set of existing criteria substantially represents the feedback the user wishes to provide for the item; in response to receiving a selection of the add feedback element, providing the ability for the user to input a new criterion that represents the feedback the user wishes to provide for the item and one or more new values for the new criterion, by providing the user the ability to input a new question corresponding to the new criterion and one or more new responses to the new question, the one or more new responses corresponding to the one or more new values; and in response to receiving from the user a selection of an existing value or a new value, aggregating the selection with existing feedback for the item, whereby the information subsequently provided for display for the item is able to include the aggregated feedback.