One of the ways to have still better (tight) control over the inventory with still less commitment of resources is by determining the AX category of items in a given inventory. Once ABC and XYZ analyses have been done and a list of A and X classes of items are drawn then AX category is a combination of the two categories. Going by the definition of A and X separately , AX category of items , normally, display a high consumption (A) as well as a high stock value (X). Essentially, these items are high value , in terms of overall procurement cost including their being costly. Obviously , the measures that need to be taken to keep AX inventory under control is similar to that of A or X items, viz stock less number at any given time, have tight consumption control, more sources so that supply doesn't become a constraint when needed etc.