What you will learn
By the end of this topic, you should be able to describe the elements of a controlled production system, connect process controls to product risk, manage status and traceability, distinguish acceptance from process validation and use production data to sustain control.
Production is an interacting system
Conforming devices result from controlled materials, methods, equipment, environments, software, people and information. Final inspection alone cannot create quality that was absent from the process.
Control the conditions that create the product, then use acceptance evidence to confirm that the defined result was achieved.
Inputs
Approved materials, components, specifications, software and labelling.
Resources
Suitable facilities, utilities, equipment, tools and trained personnel.
Methods
Controlled instructions, parameters, recipes, inspection and test methods.
Controls
Environmental, contamination, status, traceability and configuration controls.
Outputs
Conforming devices, records, release decisions and retained samples where justified.
Feedback
Yield, defects, deviations, complaints, service and process trends.
Base controls on design intent and risk
Production controls should protect critical design outputs and risk controls. For each important characteristic, define how it is created, monitored, accepted and recorded—and what happens when it moves outside control.
- Approved work instructions are available at the point of use.
- Process parameters and recipes are access-controlled and versioned.
- Equipment is maintained, calibrated or verified as appropriate.
- Environmental and contamination conditions are specified and monitored.
- Production software is validated for its intended use.
- Special processes are validated and routinely controlled.
- Changes are assessed before implementation.
Control identity, status and traceability
Materials and devices must remain identifiable from receipt to distribution. Status controls prevent unapproved, expired, quarantined or nonconforming items from being used or released.
Traceability depth should reflect regulatory requirements and risk. It may connect supplier lots, production batches, equipment, operators, process results, software configuration and distribution records. More data are not automatically better; the records must support investigation, containment and decision-making.
Plan acceptance at appropriate stages
Acceptance sampling must have a documented rationale. Use MTL-128 — Statistical Methods and Measurement Assurance to connect sampling and measurement quality to the decision.
Monitor stability—not just output volume
Useful indicators include first-pass yield, scrap, rework, defect type, process capability, downtime, calibration failures, environmental excursions, supplier performance and complaint signals. Segment data by product, line, supplier, lot, shift and time where this can reveal meaningful patterns.
Targets should not encourage concealment. A high yield can coexist with excessive adjustment, unrecorded rework or ineffective inspection. Trend data alongside deviations and qualitative observations.
Contain and learn from nonconforming product
Identify, segregate and control nonconforming material and product. Evaluate the defect, affected quantity, distribution exposure, risk and disposition. Rework requires approved instructions and confirmation that the reworked device still meets requirements.
Repeated defects, adverse trends or systemic causes should enter corrective-action processes. Supplier notification, field action or regulatory reporting may also be necessary depending on impact.
Create records that reconstruct what happened
- Product and batch identity, quantity made and quantity released.
- Dates, site, line, equipment and relevant operators.
- Materials, components and supplier lots where required.
- Approved instructions and configuration used.
- Process, inspection and test results.
- Deviations, nonconformances, rework and concessions.
- Labelling, packaging and final-release approval.
Common misconceptions
“Final inspection assures product quality.”
Inspection can detect selected defects; it cannot reliably compensate for an uncontrolled process.
“Validated means no further monitoring.”
Validated processes still require routine control, maintenance and review of performance.
“Production issues belong only to operations.”
Recurring problems may expose weaknesses in design, suppliers, risk controls or requirements and need cross-functional action.
Authoritative external references
- ISO 13485:2016 — Medical devices — Quality management systems
- FDA — Quality Management System Regulation (QMSR)
- FDA — Quality and Compliance (Medical Devices)
Apply the current regulatory and quality-system requirements for each target market.
Quality must be created and sustained by the process
A controlled production system combines capable methods, suitable resources, reliable acceptance evidence and rapid learning from variation.