During Production Inspection: Ensuring Quality Control Every Step of the Way

With our extensive experience and meticulous approach, we guarantee a thorough during production inspection that will minimize your risks and maximize your results.

during production inspection
During Production Inspection Services

During Production Inspection

What is During Production Inspection and Why is it Important?

During Production Inspection (DPI), also referred to as “In-Process Inspection” or “DUPRO Inspection,” is a vital step within the quality assurance process for the manufacturing industry. It systematically evaluates products, components, or materials during various stages of production, which helps identify defects or deviations from predetermined standards. DPI ensures that the manufacturing process is adhering to the specified requirements, reducing the risk of producing substandard goods. Below, we will delve into the significance of DPI, its benefits, and its impact on the industry.


The Importance of During Production Inspection: 

  1. Early detection of product defects: One of the primary advantages of DPI is the early identification of defects or non-conformities in the production process. Detecting these issues before the final product is assembled allows manufacturers to take corrective actions immediately, thus minimizing the need for costly rework, repairs, or returns. This proactive approach enhances overall efficiency and contributes to reduced production costs.
  2. Compliance with industry standards: DUPRO ensures the manufacturing process complies with relevant industry standards, regulations, and customer specifications. This is crucial for organizations that must adhere to strict quality control measures, such as those in the automotive, aerospace, medical, and electronics sectors. DPI facilitates the implementation of these standards, mitigating the risk of non-compliance and ensuring that the final product meets or exceeds the required performance criteria.
  3. Enhanced supplier management: During Production Inspection provides valuable insights into a supplier’s production capabilities, quality control systems, and adherence to contractual obligations. By assessing suppliers throughout the production process, companies can identify weak links in their supply chain, allowing them to make informed decisions about supplier selection, contract negotiation, and long-term partnerships.
  4. Improved customer satisfaction: Delivering high-quality products is essential for building brand reputation and fostering long-term relationships. Conducting DUPRO inspection reduces the likelihood of product defects reaching the end user by addressing quality issues during production. This, in turn, results in fewer customer complaints, returns, and warranty claims, ultimately leading to higher customer satisfaction and increased brand loyalty.
  5. Risk mitigation: Conducting During Production Inspection on time allows manufacturers to minimize the risk of product recalls, which can be costly and damaging to a company’s reputation. DPI provides an additional layer of quality control, ensuring potential issues are identified and addressed before products reach the market. This proactive approach can save companies significant time and resources while preserving their reputation in the industry.
  6. Greater control over the production process: DPI allows manufacturers to monitor and control their production process more effectively. It provides real-time data on the production status, enabling companies to make adjustments to improve efficiency and maintain product quality. This increased visibility and control result in a more streamlined and cost-effective production process.

Benefits of During Production Inspection

During Production Inspection (DPI) offers comprehensive benefits, including resource optimization, consistent product quality, reduced lead times, increased operational efficiency, enhanced supplier accountability, and significant cost savings, which drive business success and competitiveness in today’s manufacturing landscape. Here are the benefits of During Production Inspection:


Optimization of resources: During Production Inspection enables you to optimize your resources by identifying inefficiencies and areas that require improvement in the production process. Through regular inspections, you can ensure that the workforce, machinery, and raw materials are used most effectively and efficiently. This leads to increased productivity and contributes to minimizing waste and reducing the overall environmental impact of manufacturing operations.


Consistency in product quality: Consistent product quality is essential for maintaining customer trust and loyalty. By implementing DPI, you can ensure that each product batch adheres to the same quality standards, regardless of variations in production conditions, raw materials, or workforce. This consistency in product quality results in a stronger brand image and improved customer confidence, ultimately driving repeat business and referrals.


Reduced lead times: Identifying and addressing quality issues early reduces lead times. When defects are detected and corrected early on, you can avoid delays caused by rework or extensive repairs. This results in a more efficient production process, ensuring that products reach customers more quickly and allowing companies to respond more effectively to market demands.


Increased operational efficiency: During Production Inspection not only identifies defects but also helps understand the root causes of these issues. By analyzing the data collected during the inspection process, you can identify trends and patterns that may point to systemic issues in the production process. This analysis enables you to address these underlying causes, increasing operational efficiency and reducing waste and rework.


Increased supplier accountability: DUPRO inspections foster a sense of accountability among suppliers. Regular inspections motivate suppliers to maintain high-quality standards and adhere to agreed-upon specifications, knowing their performance will be closely monitored during production. This accountability can lead to improved supplier performance, which positively impacts the overall quality of the final product.

During Production Inspection Process: What to Expect

During Production Inspection (DPI) is a critical quality control measure adopted by manufacturers to ensure that products adhere to pre-established specifications and meet the desired quality standards. The DPI process involves a well-structured plan, the selection of appropriate inspection sampling methods, and the inspection of various aspects of the manufacturing process by experienced inspectors. The inspection team documents their findings in a comprehensive report, which highlights areas for improvement and facilitates corrective actions by the manufacturer.

The DPI process commences with a well-structured plan, typically devised collaboratively by the manufacturer, the client, and the quality control inspection team. This plan outlines the specific inspection objectives, methodologies, and acceptance criteria. It also encompasses the assignment of experienced inspectors, their responsibilities, and the necessary tools and equipment.

An essential aspect of the During Production Inspection process is determining the appropriate sampling method to ensure accurate, representative results. Widely adopted in the industry, the ANSI/ASQ Z1.4 standard (also known as the AQL sampling method) provides a systematic approach to determining sample sizes and acceptable defect levels. Depending on the product type, complexity, and risk tolerance, alternative sampling methods, such as the zero-acceptance number sampling plan or the sequential sampling method, may be employed.

The assigned quality control inspectors scrutinize various aspects of the manufacturing process during the inspection process. These encompass:



  1. Product Inspection: Inspectors assess the products’ conformity to pre-established specifications, evaluating aspects such as dimensions, functionality, appearance, and packaging.
  2. Process Control: Inspectors evaluate the manufacturing process to ensure it adheres to predefined standards, identifying any deviations or bottlenecks that may compromise product quality.
  3. Compliance Verification: Inspectors verify that the manufacturing facility complies with relevant industry standards, regulations, and certifications, including environmental, safety, and ethical considerations.

Upon completion of the DPI, the inspection team documents their findings, generating a comprehensive report that encapsulates the results, observations, and recommendations. This report, shared with the manufacturer and the client, is a crucial communication tool and decision-making aid, enabling corrective actions to be taken promptly.

The DPI report often highlights areas for improvement, necessitating corrective actions by the manufacturer. The inspection team collaborates with the manufacturer to devise and implement remedial measures, conducting follow-up inspections as needed to ensure the effectiveness of these actions.

When to Schedule a During Production Inspection



During Production Inspections (DPI) are usually scheduled at a specific point in the production process when a certain percentage of the products have been produced. This is usually done to identify and address any issues that may arise during the production process before the product is completed.


The timing of a During Production Inspection may vary depending on the specific product being manufactured and the production process involved. However, DPIs are typically scheduled when 20% to 40% of the production has been completed.


It is important to schedule a DPI early enough in the production process so that any issues can be identified and addressed before the production is completed. However, it should not be too early in the production process as there may not be enough products to inspect, or the product may not have reached a critical production stage where issues are likely to occur.


It is also important to consider the lead time required for the inspection process and any necessary adjustments or modifications to the production process. The inspection should be scheduled with enough time to allow any necessary changes without delaying the production schedule.

What Checks Are Carried Out During a DUPRO Inspection? A Comprehensive Checklist

During a DUPRO Inspection, Tetra Inspection will conduct a comprehensive audit to ensure the production process runs smoothly and the product meets the required quality standards. Some of the checks that Tetra Inspection will carry out during a During Production Inspection include:


Production organization and status checks:

  • Verify that the production process is well-organized and on schedule.
  • Check the quantities of semi-finished, finished, and packed products to ensure they meet the specifications.
  • Determine the estimated production capacity and predicted order completion date to ensure the production process meets the deadline.

Product specifications checks:

  • Verify that the product quantities, colors, style, and construction meet the required specifications.
  • Check the spelling, fonts, dimensions, positioning, and general design to ensure it meets the product specifications.
  • Verify that the labels, including main labels, care labels, size labels, and product tags, are correct and properly attached to the product.

Product dimensions check:

  • Check the product dimensions and match them with the required specifications
  • Verify other product-specific checks and tests to verify quality and workmanship

Packing and packaging checks:

  • Verify the unit packing, inner packing, and outer packing to ensure that they meet the required specifications
  • Check the export carton dimensions and weights to ensure that they meet the shipping requirements
  • Verify the shipping marks on cartons to ensure that they are properly labeled

Why Choose Tetra Inspection for During Production Inspection


Highly qualified inspectors

Our inspectors are highly qualified and experienced in regulatory compliance and relevant industry standards, ensuring that your production meets the highest quality standards.


Global coverage

With a presence in 40 countries and a team of 350+ inspectors, Tetra Inspection offers During Production Inspection Services within 12-24 hours, no matter where your factory is located.


Same-day inspection report

You'll receive your inspection report on the same day as your inspection, giving you timely and actionable insights into the quality of your production.


Online scheduling and progress tracking

Tetra Inspection makes it easy to schedule your inspections online, and you can track the progress of your inspections in real time through our online portal.

Schedule Your During Production Inspection Today

With our expert team of inspectors, you can rest assured that your products will undergo a comprehensive during production inspection, minimizing potential defects and guaranteeing compliance with industry requirements.

Common Questions About During Production Inspection, Answered (FAQ)

The cost of during production inspection with Tetra Inspection depends on the pricing plan selected. The standard rate is $240 per man-day.

Alternatively, you can choose a monthly plan for $189 per man-day or an annual plan, which is recommended and costs $158 per man-day.

The annual plan is billed monthly at $1,584 for 120 inspections across Asia over a 12-month subscription, representing over 35% savings compared to the standard rate.

The frequency of during production inspections will depend on various factors, such as the product’s complexity, the quality standards required by the buyer, and the risk associated with the production process. In general, During Production Inspections are recommended when 20-40% of the production is complete, as it allows you to catch quality issues early on. The specific frequency during production inspections should be determined on a case-by-case basis and may vary depending on the product and manufacturing process.

At Tetra Inspection, we have high standards for our quality control inspectors. We only hire professionals with at least five years of experience in the industry and subject matter expertise in their respective fields. Our inspectors are highly trained, professional, and well-versed with the latest regulation changes, relevant regulations, and industry standards. Additionally, our inspectors have excellent attention to detail, allowing them to identify even the smallest quality issues during inspections. Our inspectors’ qualifications ensure we provide our clients with the highest quality during production inspection services.