GM OAMI Scoring Levels: A Guide for Automotive Suppliers

GM’s Overall Automation Maturity Index (OAMI) is a five-level supplier assessment introduced in 2026 to evaluate automation and digital connectivity across the supplier value chain, from raw material purchasing through production and delivery. GM has reportedly targeted an average supplier maturity score of 4.5 out of 5, making the distinction between basic automation and integrated operations increasingly important for automotive suppliers.

TL;DR

• OAMI uses five levels to assess the degree of automation and digital connectivity in a supplier’s operations, ranging from manual production at Level 1 to a highly connected smart factory at Level 5.

• GM has not published a detailed public rubric defining the exact operational requirements for each OAMI level. The plant-floor characteristics below are based on the confirmed level names and common automation maturity conventions.

• The key difference between OAMI Level 3 and Level 4 is integration. Level 3 generally describes automated cells operating semi-independently, while Level 4 connects equipment, software, and data across the plant.

• OAMI is separate from VDA 6.3 process audits, GM’s Built In Quality Supply (BIQS) program, and the ISA-95 architecture standard. Each measures a different aspect of manufacturing maturity.

How OAMI Grades Supplier Automation

OAMI measures how far an automotive supplier has progressed from manual production toward an integrated, data-connected manufacturing environment.

The framework is broader than simply counting robots, automated machines, or production cells. It considers how automation functions across the supplier’s operation and, importantly, how effectively equipment, software, data, and people work together.

The five reported OAMI levels are:

• Manual

• Basic Mechanization

• Semiautomation

• Integrated Automation

• Smart Factory

GM has described the OAMI targets as goals rather than formal requirements. However, trade reporting has indicated that automation maturity could influence future sourcing decisions, making OAMI relevant to suppliers evaluating their competitiveness within GM’s supply base.

The assessment also appears to extend beyond the assembly line itself. OAMI considers automation across the wider value chain, including material movement, production management, quality processes, manufacturing data, and delivery, all of which can contribute to overall maturity.

What Each OAMI Level Looks Like

Each OAMI level represents a step change in the degree of automation and in how consistently equipment, software, and data communicate across the plant.

GM has not publicly released a detailed rubric specifying the exact equipment or capabilities required at each level. Based on the level names reported for the OAMI program and common automation maturity frameworks, the five levels can generally be understood as follows.

Level	Name	Plant Floor Characteristics	Human Role
1	Manual	Standalone equipment, tasks completed largely by hand, and little or no digital monitoring or data capture	Direct production participant throughout the shift
2	Basic Mechanization	Individual machines assist workers, with limited automation controls and little cross-station data sharing	Operates machines and completes most non-machine work manually
3	Semiautomation	Automated cells or stations handle discrete tasks, with monitoring and controls at the station level, but limited plant-wide integration	Works alongside automated equipment, monitors outputs, and manages exceptions
4	Integrated Automation	Automated systems are connected and coordinated, with real-time data moving across equipment, sensors, and software	Supervises processes, responds to alerts, and manages process parameters
5	Smart Factory	Equipment, MES, analytics, and other systems continuously exchange data, and production can respond dynamically to changing conditions	Primarily manages exceptions, improvement opportunities, and higher-level decisions

Level 1 generally describes a manual operation in which workers complete most production activities directly, with limited machine assistance and little digital data capture.

Level 2 adds mechanization. Machines assist with individual processes, but they largely operate as standalone assets rather than as part of a connected production environment.

Level 3 introduces semiautomation. Automated cells or stations perform defined production activities, while operators monitor performance and intervene when needed. Data may exist at individual machines or cells without flowing consistently across the plant.

Level 4 connects those automated systems. Equipment, sensors, manufacturing software, and quality systems share information so that operations can be monitored and coordinated in real time rather than managed as isolated processes.

Level 5 represents the smart factory model. Production systems are highly connected and increasingly adaptive, with people spending less time directly operating equipment and more time overseeing exceptions, optimizing, and continuously improving.

Level 3 vs. Level 4: The Key Difference

The main distinction between OAMI Level 3 and Level 4 is not necessarily the amount of automated equipment on the plant floor. It is the degree to which the equipment is connected and coordinated.

At Level 3, a supplier may already have substantial automation. Robotic cells, CNC equipment, conveyors, vision systems, cobots, or automated inspection systems can perform individual processes efficiently. The limitation is that those systems may still operate semi-independently.

A production cell may collect performance data, for example, without automatically sending that information to the MES. A quality issue detected at one station may require an operator to manually communicate the problem downstream. Production reports may still depend on spreadsheets or end-of-shift data entry.

Level 4 generally describes an environment in which those separate systems begin to function as a single, connected operation.

A quality event at one process could generate an alert elsewhere in the production workflow. Machine conditions could feed a live production dashboard. MES software could receive production counts directly from equipment rather than relying on manual entry. Maintenance, quality, inventory, and production systems could all work from a shared stream of current manufacturing data.

The practical shift is therefore from automated equipment to integrated automation.

That distinction also means suppliers may be able to improve automation maturity without replacing every existing machine. Connecting brownfield equipment, standardizing data collection, and integrating shop-floor systems can increase the value of existing automation.

How OAMI Differs From BIQS

OAMI measures automation and digital connectivity maturity, while GM’s Built In Quality Supply (BIQS) framework evaluates quality management maturity.

The programs, therefore, address different questions.

OAMI asks, in effect:

How automated, connected, and integrated is the manufacturing operation?

BIQS focuses more heavily on whether manufacturing and quality processes are controlled, documented, consistently executed, and capable of preventing defects.

BIQS includes quality-management practices such as:

• Process Failure Mode and Effects Analysis (PFMEA)

• Process control plans

• Error-proofing verification

• Gauge calibration and measurement system analysis

• Layered process audits

• Fast Response processes

• Andon systems

• Non-conforming material controls

A plant can therefore be mature in one area without being equally mature in the other.

A supplier could have extensive quality controls and strong BIQS performance while still depending heavily on manual production. Conversely, a highly automated plant could still have gaps in process discipline, quality documentation, or corrective-action systems.

OAMI should therefore be viewed as an additional automation-maturity dimension rather than a replacement for GM’s existing supplier quality requirements.

Preparing for a GM Supplier Quality Audit

Preparing for a GM supplier quality audit requires demonstrating that documented quality processes are actually being followed on the plant floor.

Evidence typically needs to show that quality controls are not merely written into procedures but are consistently implemented, monitored, and corrected when deviations occur.

Important areas include maintaining current PFMEAs and control plans, verifying error-proofing systems, completing required layered process audits, maintaining measurement systems, controlling non-conforming material, and documenting corrective actions.

Automation can support these activities by improving traceability, automatically collecting process data, identifying exceptions sooner, and creating more consistent records. However, a higher level of automation does not, by itself, demonstrate compliance with BIQS or other GM quality requirements.

OAMI and supplier quality audits, therefore, complement one another, but they are not interchangeable.

How OAMI Compares With VDA 6.3

OAMI and VDA 6.3 evaluate different dimensions of manufacturing performance.

OAMI is a GM automation maturity assessment using a five-level progression. VDA 6.3 is an automotive process audit framework developed by the German Association of the Automotive Industry (Verband der Automobilindustrie) that assesses whether manufacturing processes are capable, controlled, and consistently executed.

So while OAMI evaluates how automated and connected the operation is, VDA 6.3 evaluates how effectively the manufacturing process is managed and controlled.

OAMI is therefore an automation maturity framework, while VDA 6.3 evaluates process quality and execution. A supplier can perform well under one framework and still have opportunities for improvement under the other.

The two should not be treated as competing scoring systems because they are evaluating different characteristics of the manufacturing operation.

How OAMI Relates to ISA-95

ISA-95 was developed by the International Society of Automation (ISA) and defines how manufacturing and enterprise systems can be structured and integrated, while OAMI evaluates the maturity of automation across a supplier’s operation.

ISA-95, also published internationally as IEC 62264, organizes manufacturing technology into functional layers:

• Level 0: Physical processes, sensors, and actuators

• Level 1: Basic machine and process control

• Level 2: Supervisory monitoring and control

• Level 3: Manufacturing operations management and MES

• Level 4: Enterprise planning and ERP

These ISA-95 levels should not be confused with OAMI levels.

ISA-95 is not a maturity scale. Level 4 is not considered more advanced than Level 3. Instead, each level represents a different functional layer within the manufacturing technology architecture.

OAMI, by contrast, is intended to describe progression in automation maturity, with higher levels representing greater integration and connectivity.

The two nevertheless intersect in practical implementation.

A supplier progressing toward integrated automation will typically need many of the capabilities associated with ISA-95 Level 3, particularly MES connectivity linking shop-floor equipment to production management, quality, maintenance, inventory, and enterprise systems.

ISA-95 can therefore help structure the technical architecture of an integrated plant, while OAMI provides a way to describe the maturity of the resulting manufacturing environment.

Implementing ISA-95 architecture alone, however, does not guarantee a particular OAMI score because GM has not publicly established a direct mapping between the two frameworks.

OAMI vs VDA 6.3 vs ISA-95/IEC 62264

	OAMI	VDA 6.3	ISA-95 / IEC 62264
Owner	General Motors	VDA	ISA / IEC
Primary Focus	Automation and digital connectivity maturity	Process quality, capability and control	Manufacturing system architecture
Structure	Five maturity levels	Percentage-based process audit	Functional architecture levels
Assessment Type	Supplier maturity assessment	Process audit	Technical standard
Primary Question	How automated and integrated is the operation?	Is the manufacturing process capable and controlled?	How should manufacturing systems and enterprise systems interact?

Frequently Asked Questions

Is OAMI mandatory for GM suppliers?

GM has publicly characterized its OAMI metrics as goals rather than formal supplier requirements. Reporting has nevertheless indicated that automation maturity may influence future sourcing decisions. Suppliers should therefore distinguish between GM’s official description of OAMI as a target and reports from within the supply chain about its potential commercial implications.

When did GM launch the OAMI program?

GM began distributing OAMI self-assessment surveys to suppliers in March 2026. The program became publicly known through automotive trade reporting later in 2026. OAMI uses five maturity levels ranging from Manual to Smart Factory and is intended to assess automation across the supplier value chain.

Can a supplier reach OAMI Level 4 without replacing equipment?

Potentially. The transition from semiautomation to integrated automation is largely about connecting machines, systems, and production data rather than simply adding more automated equipment. Existing brownfield assets can contribute to a more integrated environment when their data is connected to MES, quality, maintenance, inventory, or production-management systems. GM has not, however, published detailed public criteria guaranteeing that any specific technology configuration qualifies as Level 4.

How does GM score the OAMI assessment?

GM has not published a detailed public OAMI scoring rubric or per-level assessment methodology. The reported framework uses a five-level maturity scale, with GM targeting an average supplier score of 4.5. Suppliers complete a self-assessment, and GM may validate reported maturity through further review. Because no detailed public rubric is available, specific technologies or capabilities should not be presented as guaranteed requirements for a particular OAMI level.

How to Improve OAMI Readiness With Fuuz

Fuuz is a manufacturing execution and operations platform that helps manufacturers connect machines, systems, people, and data within a single operational layer. For automotive suppliers evaluating OAMI readiness, connected architecture can help address one of the biggest gaps between isolated automation and a more integrated manufacturing environment.

Fuuz can connect sensors, PLCs, factory equipment, production lines, ERP systems, historians, databases, and other enterprise applications, enabling operational data to move across the plant in real time. The platform also includes MES, WMS, QMS, and CMMS capabilities, as well as real-time dashboards, production monitoring, maintenance management, digital work instructions, and event-driven workflows.

For suppliers working toward greater automation maturity, these capabilities can help reduce manual data handoffs, improve visibility across production and quality processes, connect existing equipment to higher-level systems, and coordinate workflows across manufacturing, maintenance, inventory, and enterprise operations. Rather than treating each automated cell as a standalone asset, Fuuz provides the integration layer needed to make those systems work together as part of a more connected operation.

If your team is evaluating its current OAMI maturity or looking for ways to improve connectivity across the plant, contact Fuuz to discuss your manufacturing environment and next steps.