ocr: pransacion New Causal ractable Dimension - Table Existing - Causal de key keys Conditionname (le Causal key Price treatment type Price: discount Existing facts Adi type Ad medias name AG: size. Displaytype Display.provider Displaysize Figure 2. A usetul causal dimension in a retail environment. The new causal key is simply inserted into the existing fact table vithout violating the grain of the fact table or changing any existing applications.