Matt Barber
On 30 June 2026, MESA International, the Manufacturing Enterprise Solutions Association, ceased operation. The same day, the International Society of Automation (ISA) took on its educational programmes and industry content, along with its community (ISA, June 2026).
It wasn't a merger in the usual sense. MESA wound down, and ISA agreed to become the home for what it had built.
MESA gave the industry its most quoted definition of MES and a common language for scoping projects. This article looks at that legacy, and what changes now.
Who were MESA?
MESA was a not-for-profit association focused on manufacturing operations and the technology that supports them. Its members included manufacturers and solution providers, as well as consultants and academics. It was best known for its models of what an MES does.
MESA described MES as a:
"dynamic information system that drives effective execution of manufacturing operations".
The MESA-11 model
In 1997 MESA published the model many people still picture when they think about MES functionality. It set out eleven core functions:
- Operations and detailed sequencing. Scheduling work in the right order on the right resources.
- Dispatching production units. Releasing work to the shopfloor as orders or batches.
- Product tracking and genealogy. Where work is, and what went into it.
- Labour management. Who is working where, and with which skills.
- Quality management. Inspections and measurements, analysed against specification.
- Resource allocation and status. Machines, tools, materials and people, and whether they're available.
- Document control. Instructions, recipes, drawings and procedures at the point of work.
- Performance analysis. Comparing actual results with goals, OEE included.
- Process management. Monitoring production and guiding operators through it.
- Maintenance management. Keeping equipment and tools available.
- Data collection and acquisition. Capturing operational data, from people and from equipment.
Two things stand out when you read that list today.
It's far broader than production execution. Quality, maintenance, labour and genealogy are all in there. That breadth is what the term MOM describes now. More in MES vs MOM.
It was a functional map, not a product specification. It described what a factory needs managed.
How the model grew
MESA kept extending its thinking. The collaborative MES (c-MES) model in 2004 added how MES connects with the rest of the business. The 2008 model went further, showing how production operations link to business operations and strategic initiatives.
The direction was clear: MES stopped being seen as a standalone shopfloor tool and became part of how the whole business runs.
What changes now ISA has it
Probably less than you'd think, at least day to day. ISA-95 and ISA-88 already underpinned much of MESA's educational work, so the content is moving to the organisation that owns the standards it was built on. If you're new to those, start with The ISA-95 model explained and ISA-88 and ISA-95.
ISA says it will share details on access and future plans through isa.org.
Configure, don't customise
One point MESA made in recent years is that MES systems should be configurable and largely out of the box, because heavy customisation makes them expensive to deploy and painful to upgrade. More in Configure, don't customise.
My view
I'd like to see MESA's practical, manufacturer-led material sitting right alongside ISA-95, so people learning MES get the standard and the real-world guidance in one place. And I strongly agree with MESA's point about configuration over customisation.
Were you a MESA member, and what would you like ISA to do with its content?
