After a supply disruption, many manufacturers decide to “diversify suppliers.” It is a sound goal, but without a plan it can turn into a long list of half-qualified vendors and a purchasing team stretched thin. This article lays out a practical approach for a mid-size plant.
Diversify where it matters
Adding a second supplier costs time and money. Engineering and quality must approve the new part, the purchasing team must manage another relationship, and splitting volume can weaken your position with the original supplier. For these reasons, diversification should focus on the parts where the risk justifies the effort.
Stage 1: Prioritize
Start with your list of single-source parts, scored for impact and likelihood of disruption. Our guide to single-source supplier risk explains how to build it. Then add two more considerations:
- Tariff exposure: parts with heavy or uncertain duty may benefit from a source in a different country. See reducing tariff exposure.
- Qualification effort: some parts can be approved quickly, while others need lengthy testing or customer approval.
Start with high-risk parts that are reasonably easy to qualify. They give you early progress while longer projects get under way.
Stage 2: Decide on the model
There are several ways to diversify, and the right one depends on the part:
- Dual sourcing: two active suppliers share the volume. This gives the strongest protection but needs the most management.
- Qualified backup: a second supplier is approved and receives small trial orders, ready to scale up if needed.
- Geographic spread: suppliers in different regions reduce exposure to one country’s trade or logistics problems.
- Alternative design: engineering approves a substitute part from a different supplier base.
Stage 3: Find and screen candidates
Look for candidates through trade directories, industry associations, your existing suppliers’ networks and your engineers’ contacts. Screen them on:
- Ability to meet your specifications and quality standards
- Capacity for your volumes, including peaks
- Lead time and location
- Financial stability
- Willingness to provide documentation, such as country of origin and material certifications
Compare candidates on total landed cost, not unit price. A cheaper part with high freight, duty and longer lead times may cost more overall. The free landed cost calculator helps with quick comparisons.
Stage 4: Qualify
Qualification usually involves samples, first-article inspection, testing and, in some industries, customer approval. Agree on the steps and responsibilities up front with engineering and quality. Track each candidate’s progress on a simple list so that projects do not stall quietly.
Stage 5: Maintain
A backup supplier that never receives an order may not be ready when you need it. Keep backup suppliers active with regular small orders, share forecasts where practical and review their performance at least once a year. Add diversification progress to your S&OP meeting so it stays visible.
Common mistakes
- Diversifying everything: spreading effort across hundreds of parts means few get finished.
- Ignoring qualification time: a new source that takes nine months to approve does not help with this quarter’s risk.
- Choosing on price alone: the cheapest quote can bring longer lead times, more variation or hidden costs.
- Forgetting the original supplier: good communication with your existing supplier can reduce risk too.
How we help
We help you prioritize which parts to diversify, compare candidate sources on landed cost and lead time, and build a tracking list your team can run. Free call first, scope agreed before we start. For the wider picture, see our procurement and tariff guide.
Frequently asked questions
How many suppliers should each part have?
For most parts, one good supplier is fine. Two or more make sense for high-impact parts where disruption would be costly. The answer comes from your risk scoring, not a fixed rule.
Does diversification always cost more?
Not necessarily, but it often adds management effort and qualification costs, and splitting volume can affect pricing. Compare options on total landed cost and risk, not unit price alone.
How long does qualification take?
It varies widely by part and industry, from weeks for simple parts to many months where testing or customer approval is required. Ask engineering and quality for realistic estimates before committing to a timeline.
Should we diversify by country as well as by supplier?
For parts with heavy tariff or logistics exposure, a second source in a different country can reduce risk that a second supplier in the same country would not.