Table 3: Suggested criteria and average rank of CTQ questionnaire.

Potential CTQAverage CTQ rank

Average inventory level4.6
Inventory holding costs4.2
Number of expired items4.2
On-time delivery4.2
Supplier reliability4.2
Safety stock level3.8
Number of stock-out incidents3.8
Actual time to get product from warehouse3.8
Effect of redundant purchases3.0
Variability of demand2.8
Shelf life2.6
Transporting costs1.4