Lessons from the Frontline of Industrial Supplier Development

Intro: Michael Spencer's Reflection on a Career in Manufacturing

Michael Spencer spent nearly 25 years at Toyota Manufacturing, mainly in internal logistics, before moving into supplier development and lean consultancy across aerospace, automotive, and rail. For the last decade, he has been parachuted into struggling suppliers to help stabilize output and restore performance.

Looking back across those decades, a clear realization emerged:

"On reflection, I spent my whole career firefighting as a result of the wrong supplier being chosen."

The crises Michael was called in to fix were rarely caused by sudden internal surprises. More often, they traced back to procurement choices made years earlier - suppliers selected on ambition rather than capability, contracts awarded without proof of capacity, and commercial structures that didn't align incentives.

The Pattern: When Suppliers Can't Deliver

One aerospace case stands out.

A supplier had secured an enviable order book, stretching years ahead. On paper, they looked like a success story. But there was no credible plan for how that backlog would actually be fulfilled. Deliveries began to slip, threatening penalties and reputational damage.

"They had the contracts, but not the capability. The order book looked great, until we asked: how will you actually make this happen?"

The response wasn't a plan, it was firefighting. A rescue team, funded by the customer, embedded on site for a year. Processes were redesigned. New equipment was specified. Output was eventually stabilized, but only because the OEM paid to build the supplier's missing capability.

It wasn't an isolated story. Similar patterns emerged in automotive logistics and aerospace sub-tiers: suppliers over-promising, procurement awarding on ambition rather than evidence, and operations left holding the bag.

The warning signs were there all along:

• Capacity plans that leaned on overtime and temps.
• Bottlenecks disguised by piles of WIP.
• Mixed messages between sales and operations.
• Convenient promises without real run-data.

Lessons for Procurement and Supplier Development

The core lesson is clear: mistakes in supplier selection cascade into massive operational and financial pain.

Supplier development teams end up spending years (and millions) fixing what could have been avoided with tougher assurance up front.

So what does "assurance" actually look like? From Michael's lived experience, here are five practices that make the difference:

1. Look Beyond the Contract

A signed order book proves demand, not delivery. What matters is whether the supplier can actually convert those orders into stable output.

Practical moves:

• Ask for real performance evidence: throughput at rate, yield trends, OEE.
• Audit constraint management: where do they buffer, and why?
• Check their last three capacity lifts: what broke, what was fixed?

2. Make Capacity Validation a Gate

Too often, "capacity review" is a slide in a presentation. It should be a hard gate: no award until the supplier has run your mix, at your rate, under realistic conditions.

Practical moves:

• Run pilot lots at takt, using your specification.
• Validate tier-n readiness: sub-suppliers, special processes, tooling.
• Make go/no-go decisions on actual run data, not assurances.

3. Align Incentives with Your Reality

Suppliers prioritize what makes sense for them. If your product isn't profitable or visible, it will slip to the back of the queue. Commercial structures need to align their incentives with your priorities.

Practical moves:

• Build in ramp incentives tied to on-time, in-full.
• Share a profitability model and discuss how to keep your product visible.
• Consider tooling or support where economics genuinely don't work.

4. Replace Assumptions with Explicit Questions

Awarding on assumptions is the shortest path to firefighting. Make it normal to ask uncomfortable, practical questions early.

Examples:

• "At our ramp rate, how much overtime are you assuming?"
• "If mix shifts by 20%, what breaks first?"
• "Which machine or sub-supplier is the single point of failure?"

5. Invest in Performance Data - Early and Ongoing

The most powerful lever isn't a new recovery team, it's better information before you award. Internal audits and KPIs are useful, but they're limited by your own line of sight.

Practical moves:

• Build a living supplier health dashboard: not just thresholds, but trends.
• Triangulate: combine audits, financial data, and delivery history with what other customers are actually experiencing.
• Bring in external intelligence so you're not the last to know when a supplier is wobbling.

Conclusion: Assurance Beats Firefighting

Michael's experience makes the point crystal clear: the difference between a stable supply base and a fragile one is rarely down to luck. It comes from whether procurement validated capability and incentives before signing, or left it to be discovered later.

"You can't outsource responsibility for supplier capability. Contracts don't clear bottlenecks. Only capability does."

Fixing suppliers after the fact is costly, messy, and often avoidable. The smarter play is to demand evidence before the award, align incentives from day one, and keep a live view of supplier health beyond your own four walls.

📥 Turn lessons into action.

Download the Supplier Capability Assurance Checklist - a practical tool to help your team validate supplier readiness before award and avoid the hidden costs of firefighting later.

This article highlights why supplier capability must be proven before award. Alongside internal checks, FlockScore offers the external reference point, showing how suppliers are performing across the market based on peer experience.