We can now measure, with sufficient speed and acceptable precision, from six to ten believed to be important raw cotton spinning properties. Considering the normal range in each measured property, a spinner would conclude that there are many, many more different kinds of bales in inventory than needed for day-after-day even running mix selection causing an impossible situation if all bales must ultimately be consumed. The use of SCI, which is affected by the same combination of properties dictating yarn making, makes the apparent impossible become not only possible, but also practical.