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How to Evaluate a Supplier’s Technical Capability Beyond Company Size

Evaluate suppliers on the work they must deliver: verify relevant experience, people, processes, quality controls, equipment, and real capacity instead of relying on company size.
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Evaluate a supplier against the specific work you need done—not its headcount, revenue, or number of facilities. Look for evidence that the supplier has the relevant expertise, people, processes, equipment, quality controls, and available capacity to meet your requirements. Then verify important claims and scale your checks to the consequences of failure.

Start with the work, not the supplier’s size

Turn the contract into observable requirements before comparing suppliers. Define the outputs, technical standards, tolerances, interfaces, delivery schedule, service levels, and any security or regulatory duties. Consider what failure would mean: a minor delay, expensive rework, service disruption, or a safety or compliance issue.

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Set minimum qualification criteria only for requirements a supplier must meet to perform acceptably. Keep those pass/fail checks separate from award criteria, which compare the merits of suppliers’ proposed solutions. For UK public contracts, Cabinet Office guidance says selection conditions should be proportionate to the contract’s nature, complexity, and cost, and warns against using them in ways that disadvantage smaller businesses without justification. Read the UK supplier selection guidance. Buyers elsewhere should apply their own procurement rules and governing law.

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Company size can provide context about financial resilience or the resources a supplier may have. It does not, by itself, establish relevant technical knowledge, process control, qualified staff, or open production time. Avoid unexplained size thresholds as a shortcut for assessing ability.

Request evidence tied to the contract

Ask for evidence that answers specific questions about the work. Keep the request proportionate: a standard, low-risk purchase rarely needs the same documentation as a safety-critical or regulated contract.

  • Comparable work: Ask for examples with scope, dates, outcomes, and customer references. Similarity to your work matters more than a long client list.
  • Delivery team: Identify the people expected to perform the work, their relevant qualifications and experience, and the availability of specialist support.
  • Methods and controls: For engineering or manufacturing, request relevant process maps, test plans, inspection points, change control, traceability, and nonconformance procedures. For software or services, examine architecture, development and release controls, support arrangements, and technical service capability.
  • Equipment and facilities: Establish which equipment, facilities, software, or infrastructure the work depends on, and whether maintenance and calibration records show they are suitable and controlled.
  • Quality performance: Review relevant validation evidence, defect trends, corrective actions, and quality-system records—not just a description of the supplier’s policies.
  • Capacity and commitments: Ask about planned loading, lead times, bottlenecks, other commitments, and any subcontractors needed to deliver the contract.
  • Certificates: Request applicable certificates, but check their scope and relevance to the work. A certificate is a signal about a system or standard; it does not prove that the proposed team, equipment, or process can meet your specification.

These categories are prompts, not a universal questionnaire. Health Canada’s medical-device quality guidance identifies facilities, personnel, infrastructure, maintenance, calibration, validation, and capacity planning among possible evidence for assessing suppliers. See Health Canada’s MDSAP guidance. The U.S. Postal Service also identifies resources, schedule feasibility, quality control, skills, equipment, and facilities as relevant supplier capability considerations. See the USPS Supplying Principles and Practices. Select evidence that bears on your purchase rather than requesting everything either source lists.

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Verify claims instead of scoring promises

For each important claim, decide what would substantiate it: a record, demonstration, reference, observation, or test. A polished presentation is not a substitute for evidence from actual work.

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  1. Review underlying records. Check relevant examples of inspection, validation, maintenance, calibration, corrective-action, or delivery records. Confirm that the records relate to the process and equipment proposed for your contract.
  2. Contact references. Ask about comparable scope, delivery, technical issues, and how the supplier handled problems. A general statement that a customer was satisfied may not reveal whether the supplier can do your particular work.
  3. Observe where risk warrants it. Use a site visit or remote assessment for important risks, focusing on the people, processes, equipment, and controls that matter to the contract. Sandia’s supplier guidance describes questionnaires and site or remote assessments as supplier-assurance methods. See Sandia’s supplier assurance guidance.
  4. Request a practical demonstration when useful. For manufactured items, a sample, prototype, first article, or first lot may provide direct evidence of fit. Choose a test that reflects the specification and the actual production or delivery process.

Define the evaluation criteria before reviewing evidence, then record what was demonstrated and what remains an assumption. The appropriate proof depends on the work: a prototype may be informative for a manufactured part but irrelevant to a routine service contract.

Assess capacity separately from technical competence

A supplier may know how to do the work but lack the people, equipment, or schedule room to do it when you need it. Check actual availability, lead times, current commitments, and bottlenecks—not just the supplier’s total workforce or installed equipment.

Find out whether a critical skill or resource depends on a particular employee, subcontractor, parent company, or affiliate. Confirm how that resource will be available to your contract and what happens if it becomes unavailable. In some UK public procurement circumstances, a supplier may rely on consortium or subcontractor capability; the required relationship and evidence should be documented under the applicable procurement rules. See the UK supplier selection guidance.

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Compare suppliers on the same basis

Use consistent evidence and the same contract scope when comparing suppliers. Keep minimum requirements as pass/fail gates, then weight comparative criteria according to the purchase’s risks and intended outcomes.

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Comparison area What to examine
Relevant track record Similarity, scope, dates, and results of prior work, supported by references or records.
Named delivery team Relevant expertise, qualifications, availability, and reliance on individual specialists.
Process control Repeatability, inspection and testing, traceability, change control, and defect handling.
Technical resources Suitability and availability of equipment, facilities, software, and infrastructure.
Quality outcomes Relevant reliability or defect evidence and how the supplier responds to problems.
Capacity and resilience Schedule feasibility, lead times, current commitments, bottlenecks, and backup arrangements.
Delivery dependencies Subcontractor management, security or regulatory duties, and support arrangements where applicable.
Evidence and residual risk Strength of corroboration, unresolved gaps, and the oversight or qualification effort needed.

Do not treat a generic scorecard or a single percentage threshold as an industry standard. Eskom’s nuclear supplier qualification and audit manual, Revision 3, gives one sector-specific example: approval at 85%–100%, conditional approval at 70%–84%, and non-approval below 70%. These are Eskom nuclear-sector criteria, not a general benchmark for other buyers or industries. See Eskom’s nuclear supplier qualification and audit manual.

Scale due diligence to risk and close material gaps

Match the depth of assessment to the likely consequences and difficulty of recovering from failure. For a routine, low-risk purchase, documented checks and credible references may be sufficient. For safety-critical, regulated, novel, or difficult-to-replace work, consider a deeper technical review, audit, demonstration, inspection, or staged approval. Sector-specific rules may require particular qualification and recordkeeping.

Document the criteria, evidence reviewed, findings, assumptions, and decision rationale. If a gap is manageable, approval can be conditional on a corrective-action plan, deadline, added testing or inspection, and a clear reassessment trigger. Eskom’s manual provides a nuclear-sector example of conditional approval with supplier action plans and increased oversight; its approach should not be treated as a universal rule. For material gaps that cannot be controlled, reject the supplier rather than relying on an unsupported promise.

These methods draw on guidance from several jurisdictions and sectors: UK public procurement, Canadian medical-device quality, U.S. Postal Service procurement, South African nuclear procurement, and Sandia supplier assurance. Their legal force and applicability differ. Private buyers should adapt the assessment to the contract and governing law, and regulated or safety-critical buyers should confirm the current applicable requirements.

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