Deutsch: Interferenz / Español: Interferencia / Português: Interferência / Français: Interférence / Italiano: Interferenza

Interference in the context of quality management refers to any element or action that disrupts, obstructs, or negatively impacts the processes and procedures intended to maintain or improve quality. This could involve anything from external factors such as supply chain issues to internal problems like miscommunication or equipment malfunctions. The goal in quality management is to identify and mitigate these interferences to ensure consistent product or service quality.


In quality management, interference can be defined as any factor that prevents a process from achieving its intended outcome. This can include a wide range of issues, such as:

  • Technical Problems: Equipment failures, software bugs, or production errors.
  • Human Factors: Miscommunication, inadequate training, or human error.
  • Environmental Factors: External conditions like weather, regulatory changes, or supply chain disruptions.
  • Organizational Issues: Poorly defined processes, lack of resources, or management deficiencies.

Interference can significantly impact the effectiveness of quality management systems (QMS). A key aspect of managing quality is to continually identify and address these interferences. Historically, many industries have developed standards and methodologies such as Six Sigma, Total Quality Management (TQM), and ISO 9001 to systematically reduce interference and enhance process reliability.

Special Considerations

Continuous Improvement: An essential principle in quality management is continuous improvement, which involves regularly evaluating and refining processes to minimize interference. Techniques like root cause analysis, Pareto analysis, and Failure Mode and Effects Analysis (FMEA) are used to identify the underlying causes of interference and develop strategies to eliminate them.

Application Areas

Manufacturing: In manufacturing, interference can manifest as machine breakdowns, inconsistent supply of materials, or defects in production processes. Addressing these interferences involves preventive maintenance, robust supply chain management, and quality control measures.

Service Industry: For service industries, interference often comes in the form of service delivery issues, such as delays, customer complaints, or service errors. Strategies to manage these interferences include improving service design, training staff, and implementing feedback mechanisms.

Healthcare: In healthcare, interferences can affect patient safety and service quality. These include equipment malfunctions, procedural errors, or communication breakdowns. Quality management in healthcare focuses on ensuring compliance with healthcare standards, staff training, and patient care protocols.

Well-Known Examples

  • Toyota Production System (TPS): TPS is renowned for its rigorous approach to eliminating interference through Just-In-Time (JIT) production, which minimizes waste and improves efficiency.
  • Lean Manufacturing: This methodology seeks to eliminate waste (muda) by identifying and removing non-value-added activities that interfere with efficient production processes.
  • Six Sigma: A data-driven approach that seeks to improve quality by identifying and eliminating causes of defects and variability in manufacturing and business processes.

Treatment and Risks

Managing interference in quality management involves several steps:

  • Identification: Recognize the sources and types of interference affecting processes.
  • Analysis: Use tools like cause-and-effect diagrams, control charts, and process mapping to understand the impact and root causes.
  • Mitigation: Implement corrective actions to address the identified interferences. This could involve process redesign, training programs, or technology upgrades.
  • Monitoring: Continuously monitor processes to ensure that interference does not recur. This requires a robust feedback and review system.

Risks: Ignoring interference can lead to several risks, including reduced product or service quality, increased costs, customer dissatisfaction, and regulatory non-compliance. Proactively managing interference helps mitigate these risks and supports the overall goals of quality management.

Similar Terms

  • Disruption: Any event that halts or impedes normal operations.
  • Variability: Inconsistencies in processes that lead to unpredictable outcomes.
  • Defect: An imperfection or shortcoming in a product or process.
  • Error: A mistake made in the process that can lead to interference with quality outcomes.


Interference in quality management is a critical concept involving any factor that disrupts or hinders the effectiveness of quality processes. Identifying and mitigating these interferences are essential for maintaining high standards of product and service quality. Effective management of interference involves continuous monitoring, analysis, and improvement to ensure processes remain robust and efficient.


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