Engineering Change Order Management for Manufacturing

Engineering Change Order management provides a controlled process for requesting, evaluating, approving, implementing, and documenting changes to products, Bills of Materials, manufacturing routings, drawings, specifications, suppliers, processes, and quality requirements.

Manufacturing products and processes rarely remain unchanged throughout their lifecycle. Materials become obsolete, customers revise requirements, suppliers change, quality problems require corrective action, manufacturing methods improve, and engineering teams identify opportunities to reduce cost or improve performance.

Without a formal change-control process, even a small modification can create incorrect Bills of Materials, outdated work instructions, excess inventory, supplier confusion, production delays, quality escapes, and inconsistent product configurations.

An Engineering Change Order should identify what is changing, why it is changing, which records and departments are affected, who must approve it, when it becomes effective, and how successful implementation will be verified.

What Is Change Order Management?

Change Order Management is the controlled process used to evaluate and implement modifications to products, manufacturing processes, specifications, documentation, suppliers, inspection requirements, and production records.

The process typically includes:

Creating a formal change request
Defining the reason for the proposed change
Identifying affected products and records
Performing cross-functional impact analysis
Evaluating technical, operational, financial, and quality risks
Obtaining required approvals
Establishing an effective date or effectivity rule
Assigning implementation actions
Updating controlled records
Communicating the approved change
Verifying successful implementation
Retaining a complete audit history

Change
Requested

➜

Impact
Analysis

➜

Cross-Functional
Review

➜

Approval

➜

Implementation

➜

Verification and
Closure

ECR, ECO, and ECN Differences

Manufacturers often use several related terms when controlling engineering changes. The exact terminology varies by company, but the following distinctions are common.

Term	Meaning	Typical Purpose
Engineering Change Request	ECR	Proposes a change and begins the review process.
Engineering Change Order	ECO	Defines the approved change, affected records, approvals, effectivity, and implementation requirements.
Engineering Change Notice	ECN	Communicates that an approved change is being released or implemented.
Deviation	Temporary authorization	Allows a controlled departure from an existing requirement for a limited quantity or time.
Waiver	Acceptance authorization	Permits acceptance or use of product that does not fully meet a specified requirement.
Document Change Request	DCR	Requests a revision to a controlled document, procedure, form, or instruction.

Organizations may combine these records into one workflow. What matters most is that the process clearly controls request, review, approval, implementation, communication, and verification.

Why Engineering Change Orders Are Needed

Products may remain active for years while materials, suppliers, production methods, customer requirements, regulatory expectations, and quality conditions continue to change.

An ECO creates a permanent record that helps answer:

What changed?
Why was the change needed?
Who requested the change?
Who reviewed and approved it?
Which parts, assemblies, and customers were affected?
Which documents and systems were revised?
When did the change become effective?
Which inventory and Work Orders used the old configuration?
How was implementation verified?
Was the change effective?

Product Traceability

Maintains a history of revisions, approvals, effectivity, and affected configurations.

Risk Reduction

Identifies unintended consequences before changes reach purchasing or production.

Cross-Functional Communication

Ensures Engineering, Quality, Purchasing, Materials, Production, and Sales evaluate the change.

Compliance Support

Provides evidence that product and process changes were reviewed and controlled.

Root Cause Analysis

Makes it easier to determine whether a change contributed to a later product or process failure.

Cost Control

Evaluates tooling, inventory, supplier, labor, inspection, validation, and implementation cost.

Common Reasons for Engineering Changes

Change Reason	Example
Product Improvement	Improve performance, durability, reliability, or usability.
Quality Problem	Correct a defect, failure, nonconformance, or recurring customer complaint.
Cost Reduction	Use a lower-cost material, supplier, component, or manufacturing method.
Supplier Change	Replace an unavailable, poor-performing, or disqualified supplier.
Material Obsolescence	Replace a discontinued or unavailable component.
Customer Requirement	Implement a new customer drawing, specification, configuration, or quality clause.
Regulatory Requirement	Address a revised legal, safety, environmental, or industry requirement.
Process Improvement	Reduce setup time, improve throughput, or remove an unnecessary operation.
Corrective Action	Implement an action resulting from root cause analysis.
Standardization	Replace several similar components or processes with one controlled standard.
Capacity Requirement	Move production to another machine, supplier, facility, or process.
Documentation Correction	Correct an error in a drawing, BOM, specification, or work instruction.

Types of Manufacturing Changes

Engineering changes may affect one record or many interconnected records.

Bill of Materials Changes

Add, remove, replace, or change component quantities and approved sources.

Routing Changes

Add, remove, revise, or resequence manufacturing operations.

Drawing Changes

Modify dimensions, tolerances, notes, materials, finishes, or configurations.

Specification Changes

Revise material, process, inspection, testing, or performance requirements.

Supplier Changes

Change approved suppliers, manufacturers, processors, or sourcing restrictions.

Quality Changes

Add inspection, traceability, certification, control-plan, or documentation requirements.

Tooling Changes

Revise fixtures, dies, molds, programs, gauges, or production tooling.

Software Changes

Revise embedded software, CNC programs, test programs, or controlled configuration files.

Bill of Materials Changes

The Bill of Materials defines the raw materials, purchased components, subassemblies, and quantities required to manufacture a product.

Because the BOM drives MRP, purchasing, inventory, production, traceability, and costing, every BOM revision should be evaluated through a controlled change process.

The three fundamental BOM change types are:

Delete a component
Modify or replace a component
Add a component

Learn more about product structures in our Bill of Materials guide.

Deleting a BOM Component

Removing a component means the material will no longer be required for future production under the revised configuration.

Before approval, the organization should evaluate:

Quantity currently on hand
Material allocated to released Work Orders
Open Purchase Orders
Supplier commitments
Material in transit
Customer-owned material
Existing finished-goods inventory
WIP built with the component
Alternate uses for remaining stock
Scrap, return, rework, or disposition cost
Customer notification requirements
Effective date and cutoff strategy

Deleting a BOM Line Does Not Eliminate Existing Inventory

Inventory, open supply, released Work Orders, and finished products containing the component must still be reviewed and controlled.

Modifying or Replacing a BOM Component

A BOM modification may involve:

Replacing one component with another
Changing the quantity required
Changing the unit of measure
Changing a manufacturer part number
Changing an approved supplier
Changing a material specification
Changing a component revision
Changing an alternate component
Changing scrap or yield factors
Changing configuration effectivity

A substitution can simultaneously create excess demand for the new component and excess inventory for the old component.

Impact Area	Typical Question
Inventory	How much old material remains and how will it be dispositioned?
Purchasing	Are open Purchase Orders for the old item still required?
MRP	When should demand shift from the old component to the new component?
Work Orders	Which released orders use the old or new configuration?
Quality	Does the new component require inspection, validation, or first article?
Costing	How will the replacement affect product and inventory cost?
Customer Requirements	Is customer notification or approval required?

Adding a BOM Component

Adding a component introduces a new material requirement into purchasing, inventory, planning, production, and quality.

The new item may require:

Creation of an Item Master record
Internal part-number assignment
Manufacturer and supplier cross-references
Approved supplier qualification
Purchase pricing and lead time
Inventory location
Unit-of-measure setup
Receiving inspection
Quality clauses
Material certification
Lot or serial traceability
New Work Order instructions
Updated assembly drawings
Updated product cost

Confirm Availability Before Approval

A technically acceptable component may still make the change impractical if it has an excessive lead time, minimum order quantity, certification limitation, or single-source risk.

Inventory Impact of Engineering Changes

Engineering changes can create several types of inventory exposure.

Inventory Category	Description
Usable Inventory	Material that can continue to be used before or after the change.
Excess Inventory	Quantity greater than the revised demand.
Obsolete Inventory	Material that cannot be used under the new configuration.
Rework Inventory	Material or assemblies that can be modified to meet the new requirement.
Scrap Inventory	Material that has no economical recovery or alternate use.
Returnable Inventory	Material that may be returned to the supplier.
Customer-Owned Inventory	Material requiring customer authorization before disposition.
Quarantined Inventory	Material placed on hold until a disposition decision is made.

Common Inventory Disposition Options

Use existing inventory until exhausted
Use the new component immediately
Apply the change to future Work Orders only
Rework existing material
Return material to the supplier
Transfer material to another product
Sell or liquidate excess inventory
Scrap material
Request customer disposition
Maintain both configurations for separate customers

Purchasing and Supplier Impact

An ECO may require purchasing to revise current commitments and establish new supply.

Cancel open Purchase Orders
Reduce open quantities
Revise required dates
Create Purchase Orders for replacement material
Qualify a new supplier
Add a new manufacturer part number
Revise quality clauses
Obtain new supplier quotations
Recalculate lead times
Review minimum order quantities
Evaluate supplier cancellation charges
Review supplier-owned work in process
Notify outside processors

Learn more about supplier controls in our Approved Vendor List guide.

See how controlled changes affect procurement in our Manufacturing Purchase Order guide.

MRP Impact of Engineering Changes

Material Requirements Planning relies on current Bills of Materials, inventory, lead times, demand, and open supply.

A BOM or effectivity change may alter:

Planned Purchase Orders
Purchase recommendations
Planned Work Orders
Component demand
Inventory forecasts
Safety stock requirements
Lead-time assumptions
Production schedules
Supplier demand signals
Shortage reports

Run MRP After the Approved Change Is Released

MRP should be recalculated after the revised BOM, effectivity, inventory disposition, and open-order decisions have been entered into the controlled system.

Work Order and Work-in-Process Impact

Released Work Orders and partially completed assemblies create some of the most difficult change-control decisions.

The ECO should identify:

Open Work Orders using the old BOM
Material already issued
Operations already completed
Current quantity in process
Finished quantity awaiting inspection
Outside processing already performed
Rework requirements
New inspection requirements
Customer order commitments
Cost impact

Implementation Strategy	When It May Apply
Use Old Configuration for Existing Work Orders	The existing version remains acceptable and the change is not urgent.
Apply New Configuration to Unreleased Work Orders	The change should affect future production but not WIP.
Rework Active WIP	The change is mandatory and existing units can be economically modified.
Stop and Hold Production	Continuing the old configuration creates significant quality or compliance risk.
Split Work Orders by Configuration	Some units may use the old revision while others use the new revision.
Scrap or Restart	WIP cannot be reworked or accepted under the new requirements.

Manufacturing Routing and Process Flow Changes

A manufacturing routing defines the sequence of operations used to produce or inspect a product.

Common routing changes include:

Adding an operation
Deleting an operation
Changing the operation sequence
Changing work centers
Changing setup instructions
Changing run time
Changing tooling
Changing machine assignments
Changing inspection criteria
Adding or removing outside processing
Changing labor or burden rates
Changing move or queue time

Existing
Routing

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Proposed Process
Change

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Quality, Capacity,
Cost, and Risk Review

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Revised
Routing

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Controlled
Implementation

Deleting a Manufacturing Operation

An operation may be removed when it is no longer required, has been replaced by automation, or duplicates another activity.

Examples include:

Removing duplicate inspection
Removing obsolete testing
Eliminating unnecessary material handling
Removing a manual approval replaced by electronic validation
Removing an operation incorporated into another step
Removing temporary first-article activity after qualification

Verify the Requirement Before Removing the Step

A process step may exist because of a customer clause, control plan, regulatory requirement, prior corrective action, or product risk that is not obvious from the routing description.

Adding a Manufacturing Operation

A new operation may be required to improve control, satisfy customer requirements, or address recurring production problems.

Examples include:

Additional inspection
Special process verification
Cleaning or preservation
Deburring
Testing
Packaging
Customer source inspection
Process validation
Rework verification
Additional quality approval

The change review should consider:

Labor requirements
Machine or equipment capacity
Inspection equipment
Employee training
Work instructions
Lead-time impact
Cost impact
Scheduling constraints
Quality records
Supplier requirements

Modifying an Existing Operation

Operation changes may improve quality, reduce cost, increase throughput, or standardize production.

Operation Element	Possible Change
Setup Instructions	Revise fixture, tooling, offset, or preparation requirements.
Process Parameters	Change temperature, pressure, speed, feed, time, or tolerance.
Work Center	Move the operation to another machine or department.
Tooling	Replace or revise tools, dies, molds, fixtures, or gauges.
Inspection	Change measurement method, sample size, frequency, or acceptance criteria.
Labor Standard	Revise setup or cycle-time expectations.
Documentation	Update instructions, drawings, photos, or checklists.
Outside Processing	Change supplier, process specification, or certification requirement.

Changing the Process Sequence

Changing operation order can improve flow but may also affect product quality and inspection results.

Sequence changes may:

Reduce lead time
Reduce material handling
Eliminate bottlenecks
Improve equipment utilization
Reduce queue time
Reduce WIP
Improve measurement access
Change dimensional results
Change surface finish or cleanliness
Affect special-process outcomes

Review Process Dependencies

Some operations must occur in a specific order because later steps depend on heat treatment, coating thickness, curing, cleanliness, dimensional stabilization, or inspection access.

Outside Processing and Supplier Changes

Outside processing may include:

Heat treatment
Anodizing
Plating
Painting
Powder coating
Welding
Brazing
Nondestructive testing
X-ray inspection
Conformal coating
Calibration
Specialty machining

Adding, removing, or changing an outside process may require:

Supplier qualification
Customer approval
Revised Purchase Orders
Updated delivery schedules
Transportation planning
Certification requirements
New traceability controls
Updated routing costs
Revised lead times
New inspection requirements

Documents and Records Affected by Engineering Changes

An ECO should identify every controlled document that must be reviewed or revised.

Record Type	Possible Change
Item Master	Description, revision, status, material, source, or lifecycle information.
Bill of Materials	Components, quantities, alternates, effectivity, or revision.
Routing	Operations, sequence, work centers, instructions, times, or outside processing.
Engineering Drawing	Dimensions, tolerances, materials, notes, or configuration.
Specification	Material, process, performance, test, or acceptance requirements.
Work Instruction	Setup, assembly, inspection, packaging, or handling requirements.
Control Plan	Characteristics, controls, methods, frequency, and reaction plans.
Inspection Plan	Measurement, sampling, equipment, and acceptance criteria.
Supplier Requirement	Quality clauses, specifications, approved sources, or certifications.
Training Requirement	New competency, instruction, qualification, or acknowledgment.
Sales Documentation	Customer configuration, quotation, contract, or order requirement.
Labels and Packaging	Marking, barcode, identification, preservation, or shipping instructions.

Engineering Change Effectivity

Effectivity defines when and where the approved change applies.

Effectivity Method	Example
Date Effectivity	Use the new revision for production beginning September 1.
Work Order Effectivity	Apply the change beginning with Work Order 12500.
Serial-Number Effectivity	Apply the change beginning with serial number 5001.
Lot Effectivity	Apply the change beginning with production lot L260901.
Quantity Effectivity	Use the old material for the next 200 units, then implement the new material.
Inventory Exhaustion	Use remaining approved inventory before switching to the new component.
Immediate Effectivity	Stop production and apply the new requirement immediately.
Customer-Specific Effectivity	Use the new configuration only for a specified customer or program.

Effective date alone may not be sufficient. The change should identify the affected Work Orders, inventory, serial numbers, lots, customers, and configurations.

Engineering Change Impact Analysis

Impact analysis determines how the proposed change affects the organization before approval.

Product and Technical Impact

Form, fit, and function
Interchangeability
Performance
Reliability
Safety
Regulatory classification
Customer approval
Validation or qualification

Operational Impact

Manufacturing routing
Capacity
Equipment
Tooling
Work instructions
Production scheduling
Outside processing
Inspection time

Supply-Chain Impact

Supplier availability
Lead time
Pricing
Minimum quantities
Supplier qualification
Open Purchase Orders
Supplier work in process
Material in transit

Quality Impact

First Article Inspection
Process validation
Inspection plans
Control plans
Measurement equipment
Quality clauses
Certification requirements
Traceability

Financial Impact

New material cost
Labor cost
Tooling cost
Inventory write-off
Supplier cancellation fees
Validation cost
Training cost
Documentation cost
Customer pricing impact

Who Should Review Engineering Change Orders?

Department	Review Responsibility
Engineering	Technical requirements, drawings, BOMs, specifications, and product performance.
Quality	Inspection, validation, compliance, traceability, and customer requirements.
Purchasing	Supplier availability, lead time, pricing, cancellation, and new sourcing.
Materials	Inventory, WIP, shortages, excess, obsolescence, and disposition.
Production	Manufacturing feasibility, work instructions, equipment, labor, and tooling.
Planning	MRP, Work Orders, capacity, schedule, and customer-delivery impact.
Inspection	Measurement capability, gauges, programming, sampling, and acceptance criteria.
Sales or Customer Service	Customer orders, contracts, delivery commitments, and notifications.
Finance	Cost, inventory reserves, write-offs, pricing, and financial authorization.
Regulatory or Compliance	Regulatory, export, safety, cybersecurity, and controlled-product requirements.
Management	Business risk, major expenditure, strategic impact, and final authorization.

Use Risk-Based Routing

A spelling correction may require limited review, while a material, supplier, safety, or regulatory change may require full cross-functional approval.

Engineering Change Risk Classification

Risk Level	Example	Suggested Control
Minor	Administrative correction with no effect on product or process.	Limited review and document approval.
Moderate	Process improvement that affects work instructions or labor.	Engineering, Production, Quality, and Planning review.
Major	BOM, material, supplier, tooling, or performance change.	Full cross-functional impact analysis and formal validation.
Critical	Safety, regulatory, customer-controlled, or flight-critical change.	Executive, customer, quality, engineering, and regulatory approval.

Recommended ECO Approval Statuses

Status	Meaning
Draft	The change is being prepared and has not entered formal review.
Submitted	The change request is ready for evaluation.
Under Review	Required departments are completing impact analysis.
Clarification Required	Additional information is needed before approval.
Approved	The change is authorized for implementation.
Approved with Conditions	Implementation may proceed only after specified requirements are satisfied.
Rejected	The proposed change is not authorized.
Implementation in Progress	Approved actions are being completed.
Verification Required	Implementation is complete but effectiveness or records must be verified.
Closed	All actions, documentation, implementation, and verification are complete.
Cancelled	The proposed change is no longer required.
Superseded	A later change replaced the original ECO.

Engineering Change Implementation

Approval authorizes the change, but successful implementation requires coordinated actions.

Implementation Action	Example
Revise Item Master	Update revision, status, material, or classification.
Revise BOM	Add, delete, replace, or change component quantity.
Revise Routing	Add, remove, or change manufacturing operations.
Update Drawings	Release the approved drawing revision.
Update Specifications	Revise applicable material or process requirements.
Disposition Inventory	Use, rework, return, transfer, hold, or scrap material.
Revise Purchase Orders	Cancel old supply and create new requirements.
Update Work Orders	Apply the correct configuration and instructions.
Train Employees	Complete required instruction and competency records.
Notify Suppliers	Communicate revised drawings, specifications, clauses, or dates.
Notify Customers	Obtain approval or communicate applicable changes.
Complete Validation	Perform first article, testing, capability, or qualification activities.

An ECO should not be closed merely because it was approved. It should remain open until all required implementation and verification activities are complete.

Implementation Verification and Effectiveness Review

Verification confirms that the approved change was implemented correctly.

Effectiveness review confirms that the change achieved its intended result without creating unacceptable new problems.

Verification Questions

Were all affected records updated?
Were obsolete documents removed from use?
Were affected Purchase Orders revised?
Were Work Orders updated correctly?
Was inventory disposition completed?
Were required employees trained?
Were suppliers and customers notified?
Was first article or validation completed?
Is the correct revision being used in production?
Were all ECO actions closed with evidence?

Effectiveness Questions

Did the change correct the original problem?
Did defect or failure rates improve?
Did the change reduce cost or lead time as expected?
Were new quality problems introduced?
Did suppliers implement the change correctly?
Were customer requirements satisfied?
Is additional corrective action required?

Engineering Change Control for ISO 9001 and AS9100

Quality-management standards expect organizations to plan and control changes that can affect product conformity, process performance, resources, responsibilities, and customer requirements.

An ECO process can provide evidence of:

Review of the purpose and consequences of the change
Technical and operational evaluation
Customer and regulatory requirement review
Approval by authorized personnel
Controlled document revision
Configuration and effectivity control
Communication to affected personnel and suppliers
Training and competency updates
Validation and verification
Implementation records
Audit history

Manufacturers should verify applicable clause references and documented-information requirements against the current standards, customer contracts, regulatory obligations, and internal procedures.

Why Engineering Change Processes Fail

Failure 1: The Change Is Not Clearly Defined

Reviewers may interpret the same request differently when the change lacks clear before-and-after information, supporting documents, or technical justification.

Failure 2: Not All Impacts Are Identified

A BOM change may affect inventory, purchasing, MRP, Work Orders, customers, suppliers, inspection, documentation, and product cost.

Failure 3: The Wrong People Review the Change

Engineering approval alone may not identify supply, quality, cost, production, inventory, or customer impact.

Failure 4: Approval Occurs Before Analysis Is Complete

Organizations may approve urgent changes before understanding inventory, WIP, supplier, or validation consequences.

Failure 5: Implementation Actions Are Not Assigned

Approval does not ensure that drawings, BOMs, Work Orders, Purchase Orders, training, and inventory records are updated.

Failure 6: Effectivity Is Unclear

Different departments may implement the new revision at different times.

Failure 7: Old Documents Remain in Use

Employees may continue using obsolete drawings, work instructions, or inspection plans.

Failure 8: Implementation Is Never Verified

The ECO is closed administratively without confirming that production, suppliers, and documents reflect the approved change.

Failure 9: Customers or Suppliers Are Not Notified

External parties may continue using the old product, drawing, specification, or process.

Failure 10: Emergency Changes Bypass Control

Urgent production changes may become permanent without formal review, documentation, or follow-up.

Engineering Change Order Best Practices

Require a clear reason and business justification.
Include before-and-after descriptions.
Attach revised drawings, BOMs, specifications, or markups.
Use risk-based cross-functional review.
Identify all affected items, assemblies, documents, and customers.
Evaluate inventory and WIP before approval.
Review open Purchase Orders and supplier commitments.
Evaluate MRP and production-schedule impact.
Define effectivity clearly.
Separate approval from implementation.
Assign actions with owners and due dates.
Require objective evidence before action closure.
Control document revisions and obsolete records.
Communicate changes to suppliers and customers.
Update employee training where required.
Verify implementation before closing the ECO.
Review effectiveness for significant changes.
Maintain complete revision and approval history.
Link ECOs with corrective actions and nonconformances.
Measure ECO performance and recurring problems.

Engineering Change Order KPIs

KPI	Purpose
Average ECO Cycle Time	Measures time from submission to approval or closure.
Review Response Time	Measures departmental review performance.
Open ECO Actions	Tracks incomplete implementation tasks.
Overdue ECO Actions	Identifies implementation delays.
First-Pass Approval Rate	Measures changes approved without rework or clarification.
ECO Rejection Rate	Tracks incomplete, unnecessary, or unacceptable proposals.
Emergency Change Rate	Measures changes requiring expedited implementation.
Inventory Write-Off Cost	Measures obsolete or unusable material created by changes.
Post-Implementation Defects	Measures quality problems after change release.
Implementation Accuracy	Measures changes completed without missed documents or records.
Change Effectiveness	Determines whether the change achieved the expected result.
Customer Approval Cycle Time	Measures time required for external approval where applicable.

Engineering Change Order Software

Electronic ECO software provides one controlled record for change requests, supporting documents, impact analysis, approvals, implementation actions, effectivity, verification, and history.

Software Capability	Change-Control Benefit
Electronic Change Requests	Standardizes required information and supporting evidence.
Impact Analysis	Identifies affected BOMs, routings, items, Work Orders, inventory, and documents.
Workflow Routing	Assigns reviewers based on change type and risk.
Electronic Approval	Records decisions, comments, dates, and conditions.
Document Attachments	Links drawings, markups, specifications, calculations, and customer records.
Action Management	Assigns implementation tasks, due dates, and required evidence.
Effectivity Control	Defines date, Work Order, lot, serial, or quantity implementation rules.
Revision History	Preserves before-and-after values and released revisions.
Notifications	Alerts reviewers and action owners.
Dashboards	Displays pending, approved, overdue, and implementation-status records.
Audit Trail	Records every request, review, approval, update, and closure.
Metrics	Measures review time, implementation performance, and recurring change causes.

Why ECO Management Should Be Integrated with ERP

Engineering changes affect the same records used by planning, purchasing, inventory, production, quality, shipping, and costing.

ERP Record	ECO Relationship
Item Master	Controls product identity, revision, status, and attributes.
Bill of Materials	Controls component requirements and configuration.
Routing	Controls manufacturing operations and sequence.
Inventory	Identifies on-hand, obsolete, rework, or affected material.
Purchase Orders	Controls supplier commitments for old and new materials.
Work Orders	Identifies production affected by old and new configurations.
MRP	Recalculates demand after approved BOM and supply changes.
Quality Records	Updates inspection, control plans, validation, and certifications.
Document Management	Controls drawings, specifications, instructions, and revision history.
Training	Identifies employees requiring new instructions or competency.
Customer Orders	Identifies contracts and customers affected by configuration changes.
Costing	Evaluates new material, labor, supplier, and inventory-disposition costs.

An ECO should not exist separately from the manufacturing records it changes. Integration allows impact analysis and implementation to use current ERP information.

Engineering Change Order Management with SimpleManufacturing™

SimpleManufacturing™ connects Engineering Change Orders with Item Master records, Bills of Materials, manufacturing routings, inventory, Purchase Orders, Work Orders, documents, quality records, employee training, customer requirements, and product costing.

Electronic Change Requests

Create standardized requests with reasons, descriptions, priorities, and supporting documents.

Cross-Functional Review

Route ECOs to Engineering, Quality, Purchasing, Materials, Production, Planning, and other affected departments.

Impact Visibility

Identify affected BOMs, inventory, Work Orders, Purchase Orders, suppliers, routings, and documents.

Electronic Approvals

Record reviewer decisions, comments, dates, conditions, and rejection reasons.

Action Item Management

Assign implementation actions with owners, due dates, status, and completion evidence.

Revision Control

Maintain controlled product, BOM, routing, drawing, specification, and document revisions.

Effectivity Management

Define when the change applies by date, Work Order, lot, serial number, or inventory exhaustion.

Implementation Verification

Confirm that records, inventory, Work Orders, Purchase Orders, training, and documents were updated.

Complete Audit History

Preserve the request, impact analysis, approvals, actions, effectivity, verification, and closure history.

One Controlled Change Record

SimpleManufacturing™ provides one connected ECO record from the initial request through review, approval, implementation, verification, and closure.

Frequently Asked Questions About Engineering Change Orders

What is an Engineering Change Order?

An Engineering Change Order is a controlled record used to review, approve, implement, and document changes to products, Bills of Materials, routings, drawings, specifications, processes, suppliers, and related records.

What is the difference between an ECR and an ECO?

An Engineering Change Request proposes the change and begins evaluation. An Engineering Change Order documents the approved change and controls implementation.

What is the difference between an ECO and an ECN?

An ECO generally controls review and approval, while an Engineering Change Notice communicates that the approved change is being released or implemented.

Why are Engineering Change Orders important?

ECOs improve traceability, reduce manufacturing risk, control revisions, support compliance, and ensure affected departments evaluate a change before implementation.

What types of changes require an ECO?

Examples include BOM revisions, component substitutions, routing changes, drawing revisions, specification updates, supplier changes, process changes, tooling changes, inspection changes, and customer-required modifications.

Who should approve an ECO?

Approvals should come from the functions affected by the change. These may include Engineering, Quality, Purchasing, Materials, Production, Planning, Sales, Finance, Compliance, and Management.

How do ECOs affect inventory?

Changes can create excess, obsolete, rework, scrap, replacement, or customer-owned inventory requiring formal disposition.

How do ECOs affect Work Orders?

The organization must determine whether active Work Orders continue under the old revision, switch to the new revision, require rework, or must be stopped and restarted.

What is engineering-change effectivity?

Effectivity defines when and where the change applies, such as by date, Work Order, lot, serial number, quantity, customer, or inventory exhaustion.

Should Engineering Change Orders include cost analysis?

Yes. Review may include material, labor, tooling, inventory write-off, supplier, training, validation, inspection, and implementation costs.

How do ECOs support ISO 9001 and AS9100?

They provide documented evidence that changes were reviewed, approved, controlled, communicated, implemented, and verified.

Can ECOs be connected to corrective actions?

Yes. Corrective action may identify a product or process change that is implemented through an ECO.

When should an ECO be closed?

The ECO should be closed only after required documents, records, inventory, Purchase Orders, Work Orders, training, validation, and implementation actions are complete and verified.

Can an approved ECO be cancelled?

Yes, but cancellation should be controlled and should evaluate any actions, purchases, inventory, or production already completed.

What is a temporary deviation?

A deviation permits a controlled temporary departure from an existing requirement without permanently revising the product or process definition.

How does ERP software improve ECO management?

ERP integration connects the change with BOMs, routings, inventory, purchasing, Work Orders, quality, documents, training, and cost records.

How does SimpleManufacturing™ manage ECOs?

SimpleManufacturing™ provides electronic requests, impact analysis, workflow approvals, actions, revision control, effectivity, implementation verification, dashboards, and complete audit history.

Control Every Manufacturing Change from Request Through Verification

Engineering Change Order management is essential for controlling product, BOM, process, supplier, drawing, specification, inspection, and documentation changes.

A strong ECO process identifies affected records, evaluates inventory and WIP, obtains cross-functional approval, defines effectivity, assigns implementation actions, and verifies completion before closure.

Prevent Uncontrolled Changes from Reaching Production

The most effective change process evaluates operational, quality, customer, supplier, inventory, cost, and compliance impacts before the new configuration is released.

SimpleManufacturing™ connects Engineering Change Orders with the manufacturing records they affect, providing complete visibility, accountability, traceability, and audit history.

Schedule an Engineering Change Order Demonstration