While not popular, it is a classic example of the Attribute Dependency technique. Attribute Dependency is one of five techniques of the innovation method called SIT (Systematic Inventive Thinking). It differs from the other techniques in that it uses attributes (variables) of the situation rather than components. Start with an attribute list, then construct a matrix of these, pairing each against the others. Each cell represents a potential dependency (or potential break in an existing dependency) that forms a Virtual Product. Using Function Follows Form, we work backwards and envision a potential benefit or problem that this hypothetical solution solves.