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Inventory
Inventory - I ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Inventory Definition ,[object Object],[object Object]
Types of Inventory ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Process ,[object Object],[object Object],(in warehouses, or  “in transit”) (often on the factory floor)
Types of Inventory Work in process Work in process Work in process Finished goods Raw Materials Vendors Customer
Water Tank Analogy for Inventory Supply Rate Inventory Level Demand Rate Inventory Level Buffers Demand Rate from Supply Rate
Independent and Dependent Demand Inventory ,[object Object],[object Object],[object Object],[object Object],[object Object]
Independent and Dependent Demand Inventory Management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reasons To Hold Inventory ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reasons To  NOT  Hold Inventory ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Driver for increasing  inventory turns  (finished goods) and  lean production/Just in time  for work in process
Inventory Hides Problems Poor Quality Unreliable Supplier Machine Breakdown Inefficient Layout Bad Design Lengthy Setups
To Expose Problems: Reduce Inventory Levels Poor Quality Unreliable Supplier Machine Breakdown Inefficient Layout Bad Design Lengthy Setups
Remove Sources of Problems and Repeat the Process Poor Quality Unreliable Supplier Machine Breakdown Inefficient Layout Bad Design Lengthy Setups
Video ,[object Object],[object Object],[object Object],[object Object]
Inventory Cost Structures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Typical Inventory Carrying Costs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Costs as % of  Inventory Value
Inventory Management Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ABC Prioritization ,[object Object],[object Object],[object Object]
ABC Prioritization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ABC Analysis Example 10 20 30 40 50 60 70 80 90 100 Percentage of items Percentage of dollar value 100  — 90  — 80  — 70  — 60  — 50  — 40  — 30  — 20  — 10  — 0  — +Class C Class A +Class B
Annual Usage of Items by Dollar Value
ABC Chart For Previous Slide A B C
Inventory Management Approaches ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Economic Order Quantity (EOQ) Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
EOQ Lot Size Choice ,[object Object],[object Object],[object Object]
EOQ Inventory Order Cycle Demand  rate 0 Time Lead time Lead time Order  Placed Order  Placed Order  Received Order  Received Inventory Level Reorder point, R Order qty, Q As Q increases, average inventory level increases, but number of orders placed decreases  ave = Q/2
Total Cost of Inventory – EOQ Model
Answer to Inventory Management Questions for EOQ Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Re-order Point Example ,[object Object],[object Object],[object Object],[object Object]
Re-order Point Example ,[object Object],[object Object],[object Object],[object Object],[object Object],Don’t forget to convert to consistent time units!
EOQ Summary ,[object Object],[object Object],[object Object],[object Object]
EOQ Exercise ,[object Object],[object Object],[object Object],[object Object]
EOQ Example

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19 inventory management

  • 2.
  • 3.
  • 4.
  • 5. Types of Inventory Work in process Work in process Work in process Finished goods Raw Materials Vendors Customer
  • 6. Water Tank Analogy for Inventory Supply Rate Inventory Level Demand Rate Inventory Level Buffers Demand Rate from Supply Rate
  • 7.
  • 8.
  • 9.
  • 10.
  • 11. Inventory Hides Problems Poor Quality Unreliable Supplier Machine Breakdown Inefficient Layout Bad Design Lengthy Setups
  • 12. To Expose Problems: Reduce Inventory Levels Poor Quality Unreliable Supplier Machine Breakdown Inefficient Layout Bad Design Lengthy Setups
  • 13. Remove Sources of Problems and Repeat the Process Poor Quality Unreliable Supplier Machine Breakdown Inefficient Layout Bad Design Lengthy Setups
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19.
  • 20. ABC Analysis Example 10 20 30 40 50 60 70 80 90 100 Percentage of items Percentage of dollar value 100 — 90 — 80 — 70 — 60 — 50 — 40 — 30 — 20 — 10 — 0 — +Class C Class A +Class B
  • 21. Annual Usage of Items by Dollar Value
  • 22. ABC Chart For Previous Slide A B C
  • 23.
  • 24.
  • 25.
  • 26. EOQ Inventory Order Cycle Demand rate 0 Time Lead time Lead time Order Placed Order Placed Order Received Order Received Inventory Level Reorder point, R Order qty, Q As Q increases, average inventory level increases, but number of orders placed decreases ave = Q/2
  • 27. Total Cost of Inventory – EOQ Model
  • 28.
  • 29.
  • 30.
  • 31.
  • 32.