Supply Chain Management (SCM) 101: Introduction to SCM - Supply Chain, Flows Product, Information, Financial, Reverse

What This Is

Supply Chain Flows refer to the movement of products, information, and financial transactions across the supply chain network. Effective management of these flows is crucial for achieving efficiency, responsiveness, and customer satisfaction. For instance, Amazon's ability to quickly deliver products to customers relies on its efficient product flow, while its financial flow enables it to manage inventory and cash flow effectively.

Key Frameworks & Formulas

• SCOR (Supply Chain Operations Reference) Model: A framework for evaluating and improving supply chain performance, covering planning, sourcing, making, delivering, and returning.
• Fisher's Model: A framework for classifying products based on their demand variability and lead time, helping to determine the optimal inventory strategy.
• EOQ (Economic Order Quantity) Formula: EOQ = ?(2DS/H), where D is demand, S is ordering cost, and H is holding cost.
• Safety Stock Formula: Safety Stock = Z ×-× ?L, where Z is the Z-score,-is the standard deviation, and L is the lead time.
• Lead Time Formula: Lead Time = Production Time + Transportation Time + Inventory Time.
• Service Level Formula: Service Level = (1 - ?) × 100, where-is the probability of stockout.
• Inventory Turnover Formula: Inventory Turnover = COGS / Average Inventory, where COGS is cost of goods sold.
• Days Inventory Outstanding (DIO) Formula: DIO = Average Inventory / (COGS / Number of Days in Period).
• Days Sales Outstanding (DSO) Formula: DSO = Average Accounts Receivable / (Sales / Number of Days in Period).
• Days Payable Outstanding (DPO) Formula: DPO = Average Accounts Payable / (Purchases / Number of Days in Period).

Step-by-Step Application

1. Calculate Safety Stock: Determine the Z-score, standard deviation, and lead time for a product. Use the Safety Stock Formula to calculate the required safety stock.
2. Implement a Warehouse Layout Change: Assess the current warehouse layout and identify opportunities for improvement. Use the SCOR Model to evaluate the impact of the change on supply chain performance.
3. Optimize Inventory Levels: Use the EOQ Formula to determine the optimal order quantity for a product. Consider the demand, ordering cost, and holding cost.
4. Analyze Lead Time: Break down the lead time into production time, transportation time, and inventory time. Identify opportunities to reduce lead time and improve supply chain responsiveness.
5. Evaluate Service Level: Determine the desired service level and calculate the required inventory level using the Service Level Formula.
6. Monitor Inventory Turnover: Track inventory turnover and days inventory outstanding to ensure that inventory levels are optimal.

Common Mistakes

• Mistake: Failing to consider the impact of lead time on inventory levels.
• Correction: Calculate the lead time and use it to determine the required safety stock and inventory level.
• Mistake: Ignoring the importance of service level in determining inventory levels.
• Correction: Evaluate the desired service level and calculate the required inventory level accordingly.
• Mistake: Failing to consider the impact of transportation time on lead time.
• Correction: Break down the lead time into production time, transportation time, and inventory time to identify opportunities for improvement.

Exam / Certification Tips

• Tricky Distinctions: Push vs pull, efficient vs responsive, Incoterms responsibility.
• Common Question Patterns: Calculating safety stock, determining optimal inventory levels, evaluating service level.
• Focus on Formulas: EOQ, Safety Stock, Lead Time, Service Level, Inventory Turnover.

Quick Practice Problem

Problem: A company has a product with a demand of 100 units per week, an ordering cost of $10, and a holding cost of $5 per unit. What is the optimal order quantity using the EOQ Formula?

Answer: EOQ = ?(2 × 100 × 10 / 5) = 20 units.

Last-Minute Cram Sheet

• EOQ = ?(2DS/H): Optimal order quantity formula.
• Safety Stock = Z ×-× ?L: Formula for calculating safety stock.
• Lead Time = Production Time + Transportation Time + Inventory Time: Formula for calculating lead time.
• Service Level = (1 - ?) × 100: Formula for calculating service level.
• Inventory Turnover = COGS / Average Inventory: Formula for calculating inventory turnover.
• Days Inventory Outstanding (DIO) = Average Inventory / (COGS / Number of Days in Period): Formula for calculating DIO.
• Days Sales Outstanding (DSO) = Average Accounts Receivable / (Sales / Number of Days in Period): Formula for calculating DSO.
• Days Payable Outstanding (DPO) = Average Accounts Payable / (Purchases / Number of Days in Period): Formula for calculating DPO.
• ‘Postponement’ delays final configuration, not production – it’s a push-pull boundary strategy: Trap answer.
• ‘Just-in-Time’ inventory strategy aims to minimize inventory levels, not eliminate them: Trap answer.