Tell stories of how things should be.
Carroll and Rosson (1992) have encouraged use of scenarios for (early stages of) interactive system (interface) development.
Sample use in sift-mail and sift-tcl by Laurence Lundblade.
Here we extend this by considering the upper-bound case of an oracle involved in the system.
Lundblade found variation in contribution and value of scenarios depending on the writer and writer's experience.
Ethnographic study by Stuart Laughton on developing network information systems for education indicated not all issues are covered by this approach to design.