Ch6. Operations Management and SCM — Quality, Process Design, and Supply Chains

What Is Operations Management?

Operations Management is the planning, organization, and control of resources and processes to efficiently create products or services.

It is not just a manufacturing concept. Patient throughput at a hospital, ticket resolution at a call center, order-cook-serve flow at a restaurant — all are operations management problems.

Core objectives of operations management:

Quality: products and services that meet customer expectations
Cost: a competitive cost structure
Speed: fast delivery and responsiveness
Flexibility: the ability to adapt to changes in demand

Types of Production Systems

Type	Characteristics	Examples
Project	Single item, one-time	Building construction, film production
Job Shop	Low volume, high variety, custom order	Custom fabrication shops
Batch	Medium volume, repeated runs	Print shops, bakeries
Continuous/Assembly Line	High volume, standardized, flow production	Automotive assembly lines
Continuous Process	24/7 non-stop flow	Oil refineries, steel mills

Quality Management

TQM (Total Quality Management)

Company-wide quality management. Rather than catching defects at inspection, TQM embeds quality throughout every process.

Core principles from W. Edwards Deming’s 14 Points:

Quality is management’s responsibility
Drive out fear; make it safe to speak up
Continuous improvement (PDCA cycle)

PDCA Cycle:

Plan: Define the problem and set objectives
Do: Execute a small-scale pilot
Check: Measure and analyze results
Act: Standardize if successful; re-plan if not

Six Sigma

A quality improvement methodology targeting a defect rate of no more than 3.4 per million opportunities (6σ). Popularized globally by Jack Welch at GE.

DMAIC Process:

Define: Define the problem and project goal
Measure: Quantify current performance
Analyze: Identify root causes
Improve: Implement and test solutions
Control: Sustain the improvement

Lean Production

Derived from the Toyota Production System (TPS). Focuses on eliminating waste.

7 Wastes (TIMWOOD):

T: Transportation (unnecessary movement of materials)
I: Inventory (excess stock)
M: Motion (unnecessary movement of people)
W: Waiting (idle time)
O: Overproduction (making more than needed)
O: Over-processing (doing more work than the customer requires)
D: Defects (rework and scrap)

Inventory Management

EOQ (Economic Order Quantity)

The order quantity that minimizes the total of ordering costs and holding costs.

EOQ = √(2DS/H)

D: annual demand
S: cost per order
H: annual holding cost per unit

Ordering more than the EOQ → excess holding costs. Ordering less → more frequent orders and higher ordering costs.

JIT (Just-In-Time)

Produce and supply exactly what is needed, when it is needed, in the quantity needed. Minimizes inventory.

Advantages: reduced inventory carrying costs, early detection of defects, space savings Disadvantages: highly vulnerable to supply chain disruptions (the COVID-19 pandemic exposed the fragility of JIT-dependent supply chains)

Supply Chain Management (SCM)

SCM manages the entire flow of value from raw material sourcing to final delivery to the end customer.

Supply Chain Structure

Supplier → Manufacturer → Distributor → Retailer → End Customer

At each stage, flows of inventory, information, cash, and physical goods occur.

The Bullwhip Effect

Small fluctuations in end-consumer demand are amplified as they move upstream through the supply chain.

Causes:

Accumulated forecast errors at each stage
Excessive safety stock built in anticipation of lead times
Batch ordering practices

Solution: real-time information sharing, demand signal transparency

Strategic Significance of SCM

A significant portion of the competitive advantage of Apple, Amazon, and Walmart comes from superior supply chains.

Apple: exclusive component contracts that lock out competitors
Amazon: Fulfillment by Amazon (FBA) — integrated logistics platform
Walmart: EDI-based real-time inventory sharing with suppliers

Learning Checklist

Can describe the five production system types with examples
Can walk through the PDCA cycle in sequence
Can list the seven wastes (TIMWOOD)
Can explain JIT’s advantages and vulnerabilities
Can explain the bullwhip effect and how to mitigate it

Key Concept Cards

Time Value of Money (TVM) ★★★★★ : Present Value (PV) = Future Value (FV) / (1+r)^n. Future Value (FV) = PV × (1+r)^n. Net Present Value (NPV): PV of cash inflows − PV of cash outflows. NPV > 0 → invest. Internal Rate of Return (IRR): discount rate at which NPV = 0.

Capital Structure and Leverage ★★★★ : Debt-to-equity ratio = Total debt / Shareholders’ equity. Financial leverage: using debt amplifies ROE (EPS swings more than EBIT). Modigliani-Miller theorem: in a perfect market, capital structure is irrelevant to firm value. In reality: tax shield from interest deductions vs. financial distress costs.

Financial Statement Analysis: Key Ratios ★★★★★ : Liquidity: current ratio = current assets / current liabilities (>2.0 healthy), quick ratio. Profitability: ROE = net income / equity, ROA = net income / total assets. Leverage: D/E ratio = debt / equity. Activity: inventory turnover = revenue / inventory. Market: P/E = price / EPS, P/B = price / book value per share.

Practice Quiz

Q. Which is more reliable — NPV or IRR — and why?

NPV is more reliable. IRR can produce multiple solutions when cash flows change sign more than once (non-conventional), and it implicitly assumes reinvestment at the IRR rate itself (often unrealistic). NPV directly measures the increase in firm value, providing a clear and unambiguous decision rule.

OIYO Editorial