Inventory Management Systems - Store Keeping: Advanced Topics

Explore advanced techniques and software used to manage inventory in a store, including Just-in-Time (JIT) inventory, Vendor Managed Inventory (VMI), and the use of barcode technology.

Inventory Management Systems – Study Notes

1. Definition & Purpose

Inventory Management System (IMS): Software or integrated set of tools that tracks, controls, and optimizes the flow of goods from suppliers to customers.
Primary goals
- Maintain optimal stock levels (avoid stock‑outs & overstock)
- Reduce carrying costs
- Improve order fulfillment speed & accuracy
- Provide real‑time visibility for decision‑making

2. Core Components

Component	Function	Typical Features
Master Data Management	Stores product, supplier, and location data	SKU/UPC codes, descriptions, unit of measure, safety stock parameters
Transaction Processing	Records every movement of inventory	Receipts, issues, transfers, adjustments, returns
Inventory Tracking	Monitors quantity & location in real time	Bin/location mapping, lot/serial tracking, FIFO/LIFO, expiration dates
Demand Forecasting	Predicts future needs	Historical sales analysis, seasonality, trend algorithms, AI/ML extensions
Replenishment Engine	Generates purchase or production orders	Reorder point (ROP), economic order quantity (EOQ), automatic PO creation
Reporting & Analytics	Turns data into actionable insights	Stock turnover, ABC analysis, days of inventory on hand (DOH), KPI dashboards
Integration Layer	Connects IMS to other business systems	ERP, accounting, e‑commerce platforms, WMS, POS, supplier portals

3. Types of Inventory Managed

Raw Materials – inputs for manufacturing.
Work‑In‑Process (WIP) – partially finished goods.
Finished Goods – ready for sale/shipment.
MRO Supplies – maintenance, repair, and operations items.
Perishables – items with limited shelf life (food, pharma).

4. Key Processes & Workflows

4.1 Receiving / Inbound

PO verification → 2. Goods receipt → 3. Quality inspection → 4. Put‑away to designated location → 5. Update inventory balances.

4.2 Order Fulfillment / Outbound

Sales order entry → 2. Allocation (reserve stock) → 3. Picking → 4. Packing → 5. Shipping → 6. Inventory decrement.

4.3 Cycle Counting & Physical Audits

Periodic cycle count: rotate through inventory segments on a schedule.
Full physical inventory: annual or bi‑annual lock‑down count.

4.4 Returns & Reverse Logistics

Receive returned item → Inspect → Decide: restock, refurbish, scrap → Adjust inventory accordingly.

5. Inventory Control Techniques

Technique	When to Use	Main Metric
ABC Analysis	Large SKU portfolios	Classification by annual consumption value (A=high, B=medium, C=low)
Safety Stock Calculation	Demand variability & lead‑time uncertainty	Safety stock = Z × σd × √L (Z = service factor, σd = demand std dev, L = lead time)
Reorder Point (ROP)	Continuous demand, stable lead time	ROP = (average demand × lead time) + safety stock
Economic Order Quantity (EOQ)	Constant demand, fixed ordering cost	EOQ = √[(2DS)/H] (D=annual demand, S=order cost, H=holding cost per unit)
**Just‑In‑

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Inventory Management Systems

Demand Forecasting

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