In this method we present the list of categories in the Information Architecture and a list of selected items in the site's content and asking the participant to palce where each item can be found in the list.
By this method we learn:
User's mental model of how they expect content to be organized
User grouping of what item's most user's grouped together
Whether the structure suports navigation
Whether the label makes sense to users.
Reverse cardsort can be done in face to face UT, In a remote UT, By email.