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Engineering Change Notice (ECN)

Quick Definition

An Engineering Change Notice (ECN) is an official notice in change management that a change has been approved. The ECN communicates the details of the approved change and authorizes the manufacturer to implement the change to the production. The ECN is used to ensure that contract manufacturers and partners are producing products to standard when changes are made.The ECN is issued when the change process begins, generally when a problem arises and is reported by a customer, manufacturing partner, or internal stakeholder. The problem is then analyzed and corrective action is determined.

What is an Engineering Change Notice (ECN)?

An Engineering Change Notice (ECN) is a pivotal document within the realm of engineering change management that serves as the formal notification and documentation of proposed changes to a product's design, components, prototyping, or associated processes. Also known as Engineering Change Orders (ECOs) or Engineering Change Requests (ECRs), ECNs are integral to maintaining control over the product lifecycle, ensuring that any modifications, revisions, or improvements are systematically evaluated, validated, and implemented. They offer a structured approach to managing change, minimizing disruptions, and effectively communicating design changes to stakeholders throughout the product's lifecycle.

Key Elements of Engineering Change Notice (ECN)

  1. Description of the Change: At the core of every ECN is a detailed description of the proposed change, outlining its scope, purpose, and the specific aspects of the product or process affected.
  2. Bill of Materials (BOM): ECNs often involve updates to the BOM, specifying alterations to components, parts, or materials used in the product.
  3. Supporting Documents: To facilitate validation and implementation, ECNs may include supporting documents such as drawings, schematics, and technical specifications.
  4. Part Number: Each ECN is associated with a unique part number, ensuring traceability and accurate record-keeping.
  5. Workflow and Automation: Many organizations leverage workflow automation and Product Lifecycle Management (PLM) systems to streamline the ECN process, enabling real-time tracking and notification.
  6. Change Control: Change control procedures govern how ECNs are initiated, reviewed, approved, and implemented, maintaining quality and compliance standards.

ECN in Product Development and Manufacturing

  • New Product Development: ECNs are instrumental in managing design changes during the development of new products, ensuring that improvements are incorporated seamlessly.
  • Manufacturing Process Optimization: In manufacturing, ECNs play a pivotal role in enhancing processes, materials, or components to improve efficiency, reduce costs, or meet regulatory requirements.
  • Medical Device Industry: The medical device industry relies heavily on ECNs to manage design changes, ensuring the safety and efficacy of healthcare products.
  • Supply Chain Impact: ECNs often extend to the supply chain, as changes in components or materials may affect procurement, inventory, and supplier relationships.

Cost Savings and Quality Management

ECNs can result in substantial cost savings by identifying and rectifying design flaws early in the product lifecycle, reducing scrap, rework, and warranty costs. Moreover, ECNs contribute to maintaining high-quality standards and adherence to regulatory requirements, critical in industries like aerospace and medical devices. Modern quality management systems (QMS) are widely used to streamline and optimize ECN processes, including automated change notifications when component, project, or document changes arise.

Real-time Communication and Collaboration

ECNs facilitate real-time communication among stakeholders, including engineers, designers, procurement teams, and manufacturing personnel. This ensures that everyone is informed of design changes, preventing misunderstandings and promoting collaboration.


In conclusion, an Engineering Change Notice (ECN) represents a structured and systematic approach to managing design changes in the product lifecycle. By providing a detailed description of proposed changes, involving supporting documents, and adhering to change control procedures, ECNs enable organizations to optimize product designs, enhance manufacturing processes, and ensure quality and compliance. The effective use of ECNs can lead to cost savings, improved product quality, and streamlined communication and collaboration among stakeholders throughout the product lifecycle.