Materials, Procurement and Healthcare Supply Chains

Introduction and context

A hospital cannot deliver safe clinical care without a reliable flow of medicines, medical devices, laboratory reagents, linen, food, cleaning materials, spare parts and information. Materials management is therefore not merely a purchasing function. It is an integrated management system that connects clinical demand, forecasting, procurement, storage, distribution, finance, quality assurance and supplier relationships.

Healthcare supply chains are particularly demanding because products may be life-saving, highly regulated, temperature-sensitive, expensive, perishable or difficult to substitute. A stock-out of an ordinary stationery item may inconvenience staff; a stock-out of insulin, oxygen, blood-banking reagents or emergency antibiotics may endanger patients. Conversely, excessive inventory immobilises working capital, increases expiry and wastage, and consumes scarce storage capacity.

The central managerial problem is to achieve the right product, in the right quantity and quality, at the right time and place, at an acceptable total cost, while maintaining resilience against disruption. This chapter explains how hospital managers can design and control that system.

Learning objectives

After studying this chapter, the learner should be able to:

1. Explain the structure and purpose of healthcare materials management.
2. Forecast demand and translate forecasts into purchasing and replenishment decisions.
3. Apply ethical and transparent procurement and tendering processes.
4. Evaluate vendors using quality, service, cost and resilience criteria.
5. Classify inventory using ABC, VED and related methods.
6. Calculate and interpret reorder levels, safety stock, economic order quantity and inventory indicators.
7. Organise stores, cold chains, pharmaceuticals, consumables and equipment controls.
8. Identify risks in healthcare supply chains and develop practical mitigation measures.
9. Use digital systems and selected AI applications responsibly.

1. The healthcare materials management system

Materials management covers planning, sourcing, purchasing, receiving, inspection, storage, issuing, use monitoring, disposal and performance review. Its scope includes both consumables and durable assets.

A hospital supply chain usually contains the following participants:

• Internal customers: wards, operating theatres, emergency departments, laboratories, pharmacies, radiology, housekeeping and maintenance.
• Procurement unit: converts approved requirements into quotations, tenders, contracts and purchase orders.
• Stores and pharmacy: receive, inspect, record, preserve and issue materials.
• Suppliers and distributors: manufacture, import, transport and support products.
• Regulators: oversee medicines, medical devices, public procurement, taxation, waste and safety.
• Patients and communities: ultimately bear the consequences of poor availability, poor quality or excessive cost.

The materials cycle begins with service planning and ends with consumption data and performance feedback. A robust system prevents two common errors: purchasing without understanding clinical need and treating the cheapest bid as automatically the best decision.

Important terminology

• Procurement: The complete process of acquiring goods and services, including planning, sourcing, contracting and contract management.
• Purchasing: The transactional act of placing orders and arranging payment.
• Inventory: Stock held for future use or sale.
• Stock-out: Complete unavailability of an item when it is required.
• Lead time: Time between placing an order and receiving usable stock.
• Reorder point: Inventory position at which a replenishment order should be initiated.
• Safety stock: Additional stock held to protect against uncertainty in demand or supply.
• Service level: Probability or proportion of demand met without a stock-out, according to the chosen definition.
• Traceability: Ability to follow a product through receipt, storage, issue, use and recall.
• Reverse logistics: Movement of returned, recalled, damaged or expired products back through the supply chain.

2. Forecasting healthcare requirements

Forecasting estimates future consumption or demand. It is not a prediction of what a department wishes to order; it is a reasoned estimate based on service volume, treatment protocols, epidemiology, seasonality, policy and available resources.

Forecasting approaches

Consumption-based forecasting uses historical issues or actual use. It is practical where records are reliable and service patterns are stable. It may reproduce past irrational use, however, and may underestimate requirements after a service expansion.

Morbidity-based forecasting estimates requirements from expected disease cases and standard treatment quantities. If expected cases are 1,200 and the protocol requires 14 tablets per case, the basic requirement is:

where Q is the required quantity, N is the expected number of cases, and u is the quantity used per case. The units must match, such as tablets per case multiplied by cases producing tablets.

Service-based forecasting links requirements to procedures, admissions, operations, tests or occupied bed-days. For example, surgical glove demand may be estimated from expected operations multiplied by gloves per operation, with an allowance for wastage.

Judgemental and scenario forecasting is useful when introducing a new service, responding to an outbreak or facing incomplete data. Best practice documents assumptions and uses more than one scenario.

Adjustments to a forecast

A basic forecast should be adjusted for:

• expected growth or decline in patient volume;
• seasonality, such as malaria or influenza peaks;
• changes in treatment guidelines;
• new technology or service introduction;
• abnormal historical events, such as a strike or epidemic;
• supplier lead-time changes;
• wastage, damage and unusable stock;
• opening inventory and stock already on order.

A simple adjusted requirement can be represented as:

Here P is the planned purchase quantity, D is forecast demand for the planning period, g is expected demand growth, w is the proportional allowance for wastage, I_o is usable opening inventory and O_c is confirmed usable stock on order. The formula assumes that growth and wastage are expressed as proportions, that opening inventory is usable during the period, and that no safety stock is included. Safety stock must be added separately when required. Negative results should normally be treated as zero planned purchase, subject to review.

Forecast error should be monitored rather than hidden. One useful measure is mean absolute percentage error, provided actual demand is not zero:

where n is the number of periods, A_t is actual demand in period t, and F_t is the forecast. MAPE is expressed as a percentage. It becomes unstable when actual demand is very small or zero, so managers should use alternative measures, such as mean absolute error, for intermittent demand.

3. Inventory policy and replenishment calculations

Inventory policy determines how much to hold, when to reorder, who may authorise issues and how exceptions are handled. A hospital should not use one policy for every item. Critical medicines, inexpensive stationery, vaccines and high-value implants have different risk profiles.

Reorder point

For relatively stable demand and lead time, the reorder point is:

where d is average demand per unit of time, L is lead time in the same time unit, and SS is safety stock. If demand is measured in vials per day, lead time must be in days and the result is vials. The formula assumes a continuous-review system and uses average demand; it does not by itself account for seasonality or correlated disruptions.

Safety stock

Safety stock protects against demand and lead-time variability. A commonly used approximation for independent, normally distributed demand during lead time is:

where z is the standard-normal factor associated with the desired cycle service level, L is average lead time, σ_d is the standard deviation of demand per time unit, d is average demand per time unit and σ_L is the standard deviation of lead time. Demand and lead-time units must be consistent. This approximation assumes independence between demand and lead time and is less reliable for intermittent, highly skewed or outbreak-driven demand. In such settings, scenario analysis and clinical risk judgement are essential.

Economic order quantity

The basic economic order quantity is:

where D is annual demand in units per year, S is ordering cost per order, and H is annual holding cost per unit. The result is units per order. The model assumes reasonably constant demand, fixed ordering and holding costs, immediate replenishment, no quantity discounts and no stock-outs. These assumptions are often violated in hospitals, so EOQ is a decision aid rather than an automatic order instruction.

Worked example. A hospital uses 12,000 syringes annually. Ordering cost is 20 currency units per order and annual holding cost is 2 currency units per syringe. Therefore:

The theoretical order quantity is approximately 490 syringes. The procurement officer must still consider package size, shelf life, storage capacity, supplier minimum order quantity and cash-flow limits.

Inventory performance indicators

Important indicators include:

Indicators must be interpreted together. High turnover may indicate efficiency, but it may also indicate dangerously low safety stock. A low expiry rate is not evidence of good management if essential items are frequently unavailable.

4. Inventory classification and control

ABC analysis

ABC analysis ranks items by annual consumption value:

A-items usually represent a small proportion of line items but a large proportion of value; they receive close review, accurate records, authorisation and frequent cycle counting. B-items receive moderate control, while C-items can use simpler controls and longer review intervals. The exact percentage boundaries are policy choices, not universal laws.

VED analysis

VED classifies clinical criticality:

• Vital: Absence may cause death or serious harm.
• Essential: Absence seriously disrupts treatment but alternatives may exist.
• Desirable: Absence is inconvenient but usually does not threaten essential care.

Combining ABC and VED produces a more useful matrix. An inexpensive vital item may require tighter control than an expensive desirable item. For example, a low-cost emergency antidote can be classified as C-V and still require high availability and emergency replenishment.

Other useful classifications include:

• HML: high, medium and low unit price;
• FSN: fast-, slow- and non-moving items;
• SDE: scarce, difficult-to-obtain and easy-to-obtain items;
• XYZ: classification by inventory-value or demand variability, according to the hospital’s defined method.

Classification should lead to differentiated action, not merely labels. Every category should specify review frequency, approval level, count frequency, safety-stock approach and escalation procedure.

5. Procurement planning and tendering

Procurement begins with an approved annual or rolling procurement plan. The plan consolidates departmental requirements, budgets, contract expiry dates, expected lead times, regulatory requirements and risks of non-availability.

Procurement cycle

1. Define the clinical or operational need.
2. Develop a precise, non-discriminatory specification.
3. Confirm budget and approval authority.
4. Select the appropriate procurement method.
5. Invite quotations or bids.
6. Evaluate technical compliance and commercial offers.
7. Obtain documented approval.
8. Issue a purchase order or contract.
9. Receive, inspect and record the goods.
10. Monitor supplier performance and close the contract.

Specifications should describe performance, quality, safety, compatibility, packaging, shelf life, delivery, training and after-sales support. They should not unnecessarily name a particular brand unless a lawful and clinically justified exception applies.

Tendering principles

Transparent tendering requires equal information to bidders, clear timelines, separation of duties, secure bid handling, documented evaluation and a defensible award decision. A technical committee should assess compliance before price comparison where technical failure would make a bid unacceptable. Evaluation criteria and weightings must be announced in advance.

The lowest purchase price may not be the lowest total cost. Total cost of ownership may include purchase price, freight, installation, validation, consumables, maintenance, energy, training, downtime, disposal and disposal-related environmental costs.

A simple weighted evaluation model is:

where Score_j is the total score of supplier j, w_i is the weight assigned to criterion i, and r_{ij} is supplier j’s rating on criterion i. Weights should sum to 1, and rating scales must be defined before evaluation. This model is appropriate for transparent comparative evaluation, but it does not replace mandatory pass/fail requirements such as product registration or patient-safety compliance.

6. Vendor evaluation and contract management

Vendor selection should assess at least six dimensions:

Supplier performance should be measured through service-level agreements. Useful contractual provisions cover delivery time, minimum remaining shelf life, rejection and replacement, cold-chain evidence, product recalls, warranty, penalties or remedies, data confidentiality and dispute resolution.

Vendor concentration is a major risk. A single supplier may provide excellent prices but create vulnerability if there is a factory closure, import restriction or transport disruption. Dual sourcing is not always possible for specialised products, but hospitals can mitigate concentration through framework agreements, approved alternatives, buffer stock, local emergency suppliers and validated substitution protocols.

7. Stores and warehouse operations

A hospital store should be secure, clean, accessible, ventilated and organised according to product characteristics. Physical layout should separate receiving, quarantine, approved stock, returns, expired stock, hazardous materials and dispatch areas.

Receiving and inspection

Goods should be checked against the purchase order, delivery note and specification. Inspection includes item identity, quantity, batch or serial number, expiry date, packaging integrity, visible damage, temperature evidence and regulatory documentation. Receipt into the system should occur only after acceptance or clearly documented conditional receipt.

Non-conforming products should be labelled and quarantined. They must not be issued accidentally while a dispute is being resolved.

Storage and issuing

Stock should be arranged to support FEFO—first expiry, first out—especially for medicines, reagents and sterile supplies. FIFO may be suitable where expiry is not significant. Shelves should be labelled, products should not be stored directly on floors, and access to controlled medicines should be restricted.

Perpetual inventory records are updated at every receipt and issue. Physical counts remain necessary because records can differ from reality through damage, undocumented issues, theft, counting error or unit-of-measure confusion. Cycle counting allows high-risk items to be counted more frequently than low-risk items.

Stock records

A bin card or electronic record should include item description, code, unit, batch or serial number where relevant, expiry date, receipts, issues, balance, source document and responsible officer. Standard item nomenclature reduces duplicate ordering, such as purchasing the same glove under several descriptions.

8. Pharmaceuticals, consumables and equipment

Pharmaceuticals

Pharmaceutical management requires attention to registration, prescription controls, storage conditions, batch traceability, expiry, recalls, controlled-drug legislation and pharmacovigilance. Look-alike and sound-alike medicines should be separated or clearly differentiated. High-alert medicines require additional safeguards such as restricted access, independent checks and standard concentrations.

Pharmacy and clinical departments should monitor near-expiry stock and redistribute it before expiry where legally and clinically appropriate. Expired or recalled medicines must be segregated and disposed of through approved procedures; they must never be returned casually to usable stock.

Consumables

Consumables include dressings, syringes, gloves, catheters, sutures and diagnostic supplies. Managers should standardise specifications where clinically safe, monitor usage per procedure and investigate unusual consumption. Sterile products require intact packaging and appropriate environmental controls. Substitution must be clinically approved; a superficially similar product may differ in size, sterility, material or compatibility.

Medical equipment

Equipment procurement must include the complete life cycle: needs assessment, technical specification, site readiness, installation, acceptance testing, user training, preventive maintenance, calibration, spare parts, cybersecurity where applicable and end-of-life disposal. A low-price device that cannot be maintained locally may have a high total cost and poor availability.

Asset registers should record identification number, location, responsible department, purchase date, warranty, service history, calibration status and replacement forecast. Critical equipment should have downtime escalation and backup arrangements.

9. Cold chains and temperature-sensitive products

Cold-chain management maintains required conditions from manufacturer to point of use. Products may be damaged by freezing, excessive heat, light, vibration or repeated temperature excursions. The correct range depends on the product and manufacturer’s instructions; managers must not assume that all temperature-sensitive products use the same range.

A cold-chain system includes qualified refrigerators or freezers, calibrated thermometers or data loggers, alarms, emergency power, documented monitoring, trained staff and contingency storage. Temperature records should identify date, time, reading, responsible person and corrective action for excursions.

When an excursion occurs, staff should:

1. quarantine affected stock;
2. record the time, duration and measured temperature;
3. protect the equipment and restore conditions;
4. consult the manufacturer, pharmacist or regulatory guidance;
5. document the disposition decision.

A product should not be released merely because it appears normal. Conversely, automatic destruction without technical assessment may waste scarce products. Cold-chain resilience includes generator testing, fuel planning, alternative refrigerators, transport validation and emergency contact lists.

10. Supply-chain resilience and risk governance

Healthcare supply chains face demand surges, epidemics, transport interruptions, currency changes, cyberattacks, product recalls, regulatory changes, natural hazards and geopolitical events. Resilience means the ability to prepare, absorb disruption, adapt and recover while protecting essential services.

A practical risk process is:

• map critical products and dependencies;
• identify failure modes and vulnerable suppliers;
• estimate likelihood and consequence;
• define preventive and contingency controls;
• assign an owner and trigger thresholds;
• test the plan through drills or simulations;
• review performance after incidents.

Resilience measures include maintaining critical-item safety stock, qualifying alternatives, using regional or local sources where appropriate, sharing information across hospitals, monitoring early-warning indicators and protecting digital systems. Excessive buffer stock is not the only answer: it may expire, consume cash and conceal poor planning.

11. Ethics, governance and regulatory responsibilities

Procurement decisions involve public funds and patient safety. Ethical requirements include impartiality, confidentiality, avoidance of conflicts of interest, fair competition, accurate records and accountability. Staff should declare interests and withdraw from decisions where impartiality may reasonably be questioned.

Governance should provide segregation of duties: one person should not independently request, approve, receive and pay for the same transaction. Approval thresholds, emergency procurement rules, audit trails and whistle-blower protections should be documented.

Regulatory obligations vary by jurisdiction but commonly include medicine and device registration, public procurement rules, controlled substances, occupational safety, waste management, import requirements, data protection and financial audit. Hospital policies must be aligned with applicable national law and professional standards.

Sustainability is increasingly relevant. Procurement can reduce environmental impact through appropriate packaging, energy-efficient equipment, reusable products where safe, responsible disposal and supplier environmental reporting. Sustainability must not compromise infection prevention or product quality.

12. Digital systems and responsible AI

An integrated enterprise resource planning or hospital information system can connect requisitions, purchase orders, goods receipts, invoices, stock balances, batch numbers and expiry alerts. Barcode or radio-frequency identification can improve identification and traceability, but technology does not correct poor item master data or undisciplined processes.

AI and analytics may support demand forecasting, anomaly detection, expiry-risk prioritisation, route planning and supplier-risk monitoring. They should be used as decision-support tools. Human review is essential because historical data may reflect stock-outs rather than true demand, and an algorithm may reproduce inequitable or clinically unsafe patterns. Governance should address data quality, explainability, access control, cybersecurity, validation, auditability and responsibility for decisions.

Applied case: emergency-medicine availability in a district hospital

Background. An illustrative 180-bed district hospital experienced repeated stock-outs of emergency antibiotics and antidotes. At the same time, its central store reported rising expiry losses.

Problem. Review showed that departments submitted irregular requisitions, item descriptions were duplicated, issues were recorded late, and purchasing was based on the previous year’s orders. One distributor supplied most emergency medicines, but its delivery lead time varied from 7 to 25 days.

Analysis. The hospital formed a multidisciplinary team involving pharmacy, emergency medicine, nursing, procurement, finance and stores. It mapped the process and classified items using ABC-VED analysis. Emergency antidotes were low-value but vital; they therefore received high-control status. The team measured daily use, supplier lead time and stock-out days. It also found that FEFO was not consistently applied.

Approach and solution. The hospital standardised item codes, established minimum and maximum levels for critical medicines, introduced a documented reorder point, and required daily electronic recording of issues. It qualified a second supplier for selected products and negotiated a framework agreement with delivery obligations. Critical stock was held in a secure pharmacy sub-store, with weekly review. Near-expiry reports supported redistribution to departments with higher consumption. Emergency procurement remained available but required retrospective review.

Outcome. In the following six-month review, stock-out days for the selected medicines declined substantially, while expiry losses fell because stock was redistributed earlier. The hospital did not attempt to maximise inventory turnover; it prioritised availability for vital items and controlled costs through standardisation and better visibility.

Learning points. Classification must reflect clinical criticality as well as monetary value. Better data can reduce both shortages and excess. Supplier diversification should be targeted at high-risk items, and emergency procurement should not become a substitute for routine planning.

Challenges and limitations

No inventory model is universally optimal. Historical consumption may be distorted by previous shortages; forecasts may fail during epidemics; EOQ assumptions may not fit intermittent demand; service-level targets may be unaffordable; and sophisticated software may be ineffective where electricity, connectivity or staff capacity is unreliable. Classification boundaries are managerial conventions rather than scientific constants.

Managers should therefore combine quantitative analysis with clinical judgement, scenario planning and transparent review. The aim is not mathematical precision for its own sake but defensible decisions that protect patients and use resources responsibly.

Best-practice checklist

• Maintain an approved, regularly updated procurement plan.
• Use standard item codes and units of measure.
• Link forecasts to service volume and treatment protocols.
• Classify items by both value and clinical criticality.
• Use FEFO for products with expiry dates.
• Separate quarantined, recalled and expired stock.
• Monitor stock-outs, expiry, supplier performance and total cost.
• Use documented, competitive and conflict-free procurement.
• Include maintenance, training and life-cycle cost in equipment decisions.
• Validate cold-chain equipment and prepare power-failure contingencies.
• Maintain alternative sources for critical products where feasible.
• Review data quality before relying on software or AI recommendations.

Chapter Summary

Materials management integrates forecasting, procurement, inventory control, storage, distribution, equipment life-cycle management and supplier governance. Effective hospital supply chains balance availability, quality, cost and resilience rather than pursuing the lowest purchase price alone. Forecasting may be based on consumption, morbidity, services or scenarios, but assumptions and forecast error should be monitored. Reorder points combine expected demand during lead time with safety stock, while EOQ is a conditional planning model rather than an automatic rule.

ABC analysis controls monetary value; VED analysis protects clinical criticality. Their combination supports differentiated controls. Transparent tendering requires objective specifications, documented evaluation, segregation of duties and ethical conduct. Stores require accurate records, inspection, quarantine, FEFO, cycle counting and secure access. Pharmaceuticals and cold-chain products require special controls, while equipment decisions must include maintenance and total life-cycle cost. Resilience depends on risk mapping, supplier diversification, contingency stock, validated alternatives and tested emergency procedures. Digital systems and AI can improve visibility and forecasting only when data quality, human oversight and governance are present.

Key Terms

Materials management: Integrated planning, acquisition, storage, issue and control of hospital materials.

Procurement: Complete process of sourcing, contracting and acquiring goods or services.

Lead time: Time from order placement to receipt of usable stock.

Safety stock: Additional inventory held against demand or supply uncertainty.

Reorder point: Stock position that triggers replenishment.

EOQ: Economic order quantity calculated under specified cost and demand assumptions.

ABC analysis: Classification by annual consumption value.

VED analysis: Classification by clinical criticality as vital, essential or desirable.

FEFO: First-expiry, first-out issuing method.

FIFO: First-in, first-out issuing method.

Stock-out: Unavailability of a required item.

Service level: Defined probability or proportion of demand supplied without shortage.

Cold chain: System maintaining specified conditions for temperature-sensitive products.

Quarantine: Controlled separation of goods pending inspection or decision.

Total cost of ownership: Purchase and subsequent costs over an item’s useful life.

Vendor evaluation: Structured assessment of supplier quality, cost, service and risk.

Traceability: Ability to track an item through the supply chain.

Reverse logistics: Handling of returns, recalls, expired or damaged goods.

Resilience: Capacity to prepare for, withstand, adapt to and recover from disruption.

Cycle counting: Scheduled counting of selected inventory items instead of relying only on an annual count.

Review Questions

Short Answer Questions

1. Distinguish procurement from purchasing.
2. What is the purpose of safety stock?
3. Explain the difference between ABC and VED analysis.
4. Why is FEFO important in pharmaceutical stores?
5. State four controls required for a hospital cold chain.

Long Answer Questions

1. Explain the healthcare procurement cycle from needs assessment to contract management.
2. Discuss how a hospital should design a vendor-evaluation framework.
3. Describe the organisation of a safe and efficient hospital store.
4. Explain the assumptions, uses and limitations of EOQ and reorder-point models.
5. Discuss ethical, regulatory and governance requirements in hospital procurement.

Analytical / Application Questions

1. A hospital has frequent stock-outs of a low-cost emergency antidote but excess stock of several expensive medicines. Analyse how ABC-VED classification and differentiated controls could address the problem.
2. A supplier offers the lowest price but has unreliable delivery and no documented business-continuity plan. Develop a procurement recommendation using total cost, clinical risk and resilience criteria.
3. A refrigerator records a temperature excursion affecting vaccines. Design the immediate response, investigation, documentation and prevention plan.

Multiple Choice Questions with Answers

Question 1

Which classification primarily reflects the clinical criticality of an item?

A. ABC

B. VED

C. FIFO

D. HML

Correct Answer: B. VED

Question 2

In the reorder-point formula ROP = d × L + SS, what does SS represent?

A. Supplier score

B. Seasonal sales

C. Safety stock

D. Storage space

Correct Answer: C. Safety stock

Question 3

A hospital uses 12,000 units annually, ordering cost is 20 currency units per order, and annual holding cost is 2 currency units per unit. The basic EOQ is approximately:

A. 120 units

B. 245 units

C. 490 units

D. 1,200 units

Correct Answer: C. 490 units

Question 4

Which issuing method is generally most appropriate for products with expiry dates?

A. LIFO

B. FEFO

C. Random issue

D. Highest-price first

Correct Answer: B. FEFO

Question 5

What should normally happen to a product that fails receiving inspection?

A. Issue it immediately

B. Mix it with approved stock

C. Quarantine and investigate it

D. Destroy it without documentation

Correct Answer: C. Quarantine and investigate it

Question 6

Which item may require tight control despite having low monetary value?

A. A vital emergency antidote

B. Routine office paper

C. Decorative furniture

D. Nonessential signage

Correct Answer: A. A vital emergency antidote

Question 7

Which factor is part of total cost of ownership for medical equipment?

A. Only the catalogue price

B. Maintenance and training costs

C. Only the supplier’s advertising budget

D. The number of tender documents

Correct Answer: B. Maintenance and training costs

Question 8

A basic ABC analysis classifies inventory mainly according to:

A. Clinical urgency

B. Annual consumption value

C. Temperature range

D. Supplier location

Correct Answer: B. Annual consumption value

Question 9

What is the first appropriate action after identifying a cold-chain temperature excursion?

A. Release all products because packaging looks normal

B. Quarantine affected stock and document the event

C. Delete the temperature record

D. Transfer products to ordinary shelves without review

Correct Answer: B. Quarantine affected stock and document the event

Question 10

A major limitation of using historical consumption alone for forecasting is that it may:

A. Eliminate the need for clinical input

B. Reflect previous stock-outs rather than true demand

C. Guarantee accurate epidemic forecasts

D. Measure supplier quality directly

Correct Answer: B. Reflect previous stock-outs rather than true demand