Manufacturing execution software—usually called a manufacturing execution system (MES)—coordinates production work as it happens on the plant floor. It turns production plans into operational workflows, tracks activity and results, and exchanges data with process-control and enterprise systems. In the ISA-95 model, MES is commonly associated with Level 3 manufacturing operations management.
What does manufacturing execution software do?
An MES helps manage production from the launch of a job order through the completion of finished products. It uses current production data to guide work, respond to activity, and report results. NIST describes the system as a bridge between business systems and plant-floor or process-control systems: it can download recipes and work schedules, then upload production results. NIST’s glossary definition attributes this description to NIST SP 800-82 Rev. 2 and NISTIR 6859.
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In practice, a plant may use MES to coordinate work instructions, materials, equipment, operators, and production records. Depending on the system and deployment, its scope can include:
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- Quality: maintaining quality-related operational records and results.
- Inventory: tracking materials and finished goods as they move through production.
- Production maintenance: supporting maintenance operations related to manufacturing.
These are functional areas described in ISA’s MES overview, not a promise that every MES includes the same modules. ISA-95 describes activity models and information exchanges; the capabilities available in a particular system depend on its product scope and implementation.
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Where MES fits in ISA-95
ISA-95, also known internationally as IEC 62264, provides a framework for describing manufacturing and enterprise functions and how they exchange information. Its levels offer a useful way to distinguish plant-floor control from manufacturing operations and business planning:
| Level | Function |
|---|---|
| 0 | The physical production process |
| 1 | Sensing and manipulating the production process |
| 2 | Monitoring and supervisory control |
| 3 | Manufacturing operations management, including MES and systems such as SCADA |
| 4 | Business planning and logistics, including ERP activities |
This is a reference model, not a strict map of every software product. A useful shorthand is that control systems supervise equipment and processes, MES coordinates and records operational work, and ERP handles broader enterprise planning and logistics. ISA-95 focuses especially on interfaces between Levels 3 and 4, while the standard also describes Level 3 operations and transactions. See the ISA-95 standard overview and the IEC catalog entry for IEC 62264-1:2013, Edition 2.
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Standards editions should not be conflated: ISA announced ANSI/ISA-95.00.01-2025, “Enterprise-Control System Integration – Part 1: Models and Terminology,” on April 10, 2025. The IEC catalog entry linked above describes the 2013 second edition, not the 2025 ISA edition. ISA’s 2025 announcement summarizes the newer edition’s scope and terminology.
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The distinction is about the work each layer is responsible for, rather than a guarantee that products never overlap:
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- Control systems: monitor and supervise equipment or production processes.
- MES: coordinate work at the manufacturing-operations level and keep records of what happened during production.
- ERP: support broader business planning and logistics.
MES connects these operational and business contexts by exchanging work information and production results. The exact boundary depends on the systems and how a plant implements them; ISA-95 describes functions and interfaces rather than prescribing one universal software bundle.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to assess when considering an MES
There is no single best MES for every plant. A practical evaluation should start with the plant’s workflows and required records, then test whether a candidate system can fit its existing environment:
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- Production fit: Check whether the system can represent the plant’s production type, work steps, and unit- or lot-level records.
- Functional coverage: Identify which production, quality, inventory, and maintenance activities must be managed, and confirm which are actually included in the proposed deployment.
- Interoperability: Map the information that must pass between the MES, control systems, ERP, and related applications. Confirm that the interfaces support those exchanges.
- Operational recordkeeping: Determine how the system will capture accurate records for workflows, equipment, workstations, operators, and production activity.
- Implementation and support: Assess the effort to configure workflows and integrations, and how the system will be supported and maintained over time.
These criteria follow from MES’s documented responsibilities and integration role; they are a decision framework, not a ranking of vendors.
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