Auditoría de proveedores: guía y checklist

The quality supplier audit is an indispensable process for any plant looking to maintain the strength of its supply chain and meet international regulatory requirements. In a globalized market, where raw materials and supplies come from different countries and customers are increasingly demanding, having reliable, audited suppliers becomes a factor of survival and competitiveness.

It isn't just about assessing whether a supplier delivers on time or honors contracts. Auditing means thoroughly examining how they work, what checks they apply, how they manage product traceability, and whether they meet recognized standards such as ISO 9001, ISO 14001, ISO 22000, IFS or BRCGS. This level of control ensures that what arrives at the plant meets the quality and safety requirements that end customers demand.

In this article we'll look at what a supplier audit is, why it's so relevant for plants, what the key steps are to carry it out, what challenges tend to arise and how digitalization is transforming supplier quality audit into a more agile, effective process.

What is a quality supplier audit

The quality supplier audit is a systematic, documented review carried out on supply chain partners to verify that they meet the quality, safety, sustainability and regulatory compliance criteria required by the plant.

In practice, this involves reviewing:

• Production processes of the supplier.
  
• Document management: certificates, records, procedures.
  
• Traceability systems of raw materials and finished products.
  
• Compliance with international standards such as ISO, IFS or BRCGS.
  
• Safety and environmental checks.
  

The goal isn't to penalize, but to ensure the supplier is able to deliver products that are consistent, safe and compliant with what was agreed.

Why it's important to audit suppliers

Plants tend to focus on their own internal quality processes, but forget that the chain starts outside their facilities. A defective raw material can ruin an entire production batch or even trigger a health crisis. That's why supplier quality audit is so crucial.

Risks of not auditing suppliers

• Production incidents: defective raw materials cause stoppages or rework.
  
• Problems in external audits: if the supplier doesn't meet standards, the plant can lose certifications.
  
• High costs: returns, claims, waste.
  
• Reputational damage: in sectors such as food, a supplier failure can end in a product recall.
  

Benefits of auditing suppliers

• Guaranteed regulatory compliance across the whole chain.
  
• Reduced risks operational and legal.
  
• Greater customer trust and business partners.
  
• Strategic relationship with suppliers, based on continuous improvement.
  

The audit isn't an isolated external check, it's a tool to strengthen the plant's overall competitiveness.

Types of supplier audit

Within the framework of quality supplier audit, there are several approaches depending on the objectives:

1. Initial or approval audit: carried out before working with a new supplier to make sure they meet the minimum requirements.
   
2. Periodic audit: scheduled reviews of active suppliers to check they maintain the standards.
   
3. Follow-up audit: after detecting non-conformities, it's checked that the corrective actions have been applied correctly.
   
4. Regulatory compliance audit: focuses on verifying that the supplier complies with local and international regulations.
   

Each type responds to a different need, but all aim to strengthen the reliability of the supply chain.

Steps to carry out a quality supplier audit

A supplier quality audit effective one must follow a structured process. These are the key steps:

1. Define evaluation criteria

Before auditing, the plant must set the parameters it will assess. These can be based on:

• ISO 9001, ISO 22000, IFS, BRCGS standards.
  
• Specific contractual requirements.
  
• Sustainability or environmental indicators.
  

2. Audit planning

• Select the audit team.
  
• Determine dates, duration and scope.
  
• Communicate the objectives and requirements to the supplier.
  

3. Audit execution

• Document review: certificates, procedures, records.
  
• Facility visit: observing processes, hygiene, safety.
  
• Staff interviews: checking training level and quality culture.
  
• Traceability verification: following a batch from raw material to finished product.
  

4. Recording findings

Every observation must be documented with objective evidence: photographs, documents, records, interviews.

5. Final report

The report must include:

• Conformities.
  
• Major and minor non-conformities.
  
• Improvement recommendations.
  

6. Corrective action plan

The supplier must submit a plan with owners, due dates and specific measures to correct the failures detected.

7. Follow-up

The supplier quality audit doesn't end with the report. It's key to carry out follow-up to ensure the changes are implemented.

Most relevant international standards in supplier auditing

In a quality supplier audit, the most common reference frameworks are:

• ISO 9001 (quality management): requires documented processes and continuous improvement.
  
• ISO 14001 (environmental management): assesses environmental impact and legal compliance.
  
• ISO 22000 (food safety): establishes traceability and hazard control.
  
• IFS (International Featured Standards): widely required in the European distribution chain.
  
• BRCGS (Brand Reputation Compliance Global Standard): guarantees product safety and trust.
  

Each standard brings specific requirements that must be verified during the audit.

Common challenges in supplier auditing

Although supplier quality audit is essential, it also faces difficulties:

• Supplier resistance to being audited.
  
• Lack of internal resources to carry out periodic audits.
  
• Excessive manual documentation.
  
• Difficulty consolidating evidence quickly and clearly.
  

Overcoming these challenges requires preparation, a culture of collaboration and support from technology tools.

Digitalization: the future of supplier auditing

Digitalization is transforming supplier quality audit into a more agile, reliable process. Instead of relying on scattered paperwork, folders and emails, plants can:

• Use digital checklists customizable.
  
• Capture evidence on the plant floor with photos and videos in real time.
  
• Share automatic reports with suppliers instantly.
  
• Centralize audit histories on a secure platform.
  
• Reduce preparation times by up to 70%.
  

The difference is clear: while a manual system creates inefficiency and errors, digitalization delivers traceability and confidence.

How Solved simplifies supplier audits

The platform Solved has been designed to simplify all processes related to quality supplier audit. Some of its key features are:

• Adaptable digital checklists to ISO, IFS and BRC.
  
• Real-time logging of incidents and findings.
  
• Digital evidence (photos, videos, documents).
  
• Corrective actions assigned automatically with owners and due dates.
  
• Tracking dashboards that show the status of audits and open non-conformities.
  

With Solved, plants can move from slow, manual audits to agile, collaborative processes ready for any certification.

Conclusion

The quality supplier audit is not a bureaucratic formality: it's the tool that ensures the entire supply chain operates to the same standards the plant applies to itself. Auditing suppliers means reducing risk, ensuring regulatory compliance and strengthening trust with customers and markets.

The future of these audits lies in digitalization. With tools like Solved, companies achieve full traceability, automatic reports and smooth collaboration with suppliers. This way, auditing stops being a drain on time and becomes a competitive advantage.

Want to audit your suppliers more efficiently and ensure regulatory compliance across your entire supply chain? Book a demo of Solved and discover how to transform your supplier quality audit into an efficient, digital process.