What are the most important features of a data warehouse?

   DRILL DOWN, DRILL ACROSS, Graphs, PI charts, dashboards and TIME HANDLING

To be able to drill down/drill across is the most basic requirement of an end user in a data warehouse. Drilling down most directly addresses the natural end-user need to see more detail in an result. Drill down should be as generic as possible becuase there is absolutely no good way to predict users drill-down path.