Difference between p system and q system of inventory system


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Difference between p & q systems of inventory planning

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FIXED ORDER INTERVAL SYSTEM OR P-SYSTEM 
· Inventory position is monitored at discrete point in time 
· Once an order is placed at time t, another order can not be placed until (t + T), and the 
second order will not be filled until the lead time period has elapsed, at (t + T + L) 
· Thus safety stock protection is needed for the lead-time L plus the order interval T 
· In the fixed order size system, safety stock is needed only for the lead-time period, 
because the inventory position is monitored with each transaction 
· In the fixed order size system, a higher than normal demand causes a shorter time 
between orders whereas in the fixed order interval system, the result would be a larger 
order size 
· Predetermined inventory level (E) 
E = S + RT + LR 
Where S is the safety stock considering demand variation during (T + L) 
period and (RT + LR) is the average demand during (T + L) period · The order interval (T) 2 
0 = = 
HR 

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