OEE - From indicator to real production transformation with MES and APS
In many factories, things appear to run smoothly, machines operate, operators work, and orders are completed. Yet, at the end of the day, the numbers do not meet expectations, and actual performance remains below its potential. Why? Because between being "busy" and being "efficient" there is a difference that only data can clearly reveal.
This is where OEE (Overall Equipment Effectiveness) comes in, the indicator that reveals how much of the planned production time is converted into real value for the customer. When OEE becomes the central measurement tool, MES and APS solutions from Senior Software turn this indicator into a true performance driver.
What is OEE and why is it considered the "gold standard" in manufacturing?
OEE measures, in percentage terms, the real efficiency of a production process. Simply put, it shows how close the production process is to perfection: producing only good parts, at the maximum possible speed, without unplanned downtime.
Thus, OEE provides a clear benchmark for performance evaluation in manufacturing, and its values can be interpreted as follows:
- 100% OEE - ideal production, with no downtime, zero defects, and maximum operating speed
- 85% OEE - "world-class" level, considered the top standard for discrete manufacturers
- 60% OEE - typical for many factories, but with significant room for improvement
- 40% OEE - often encountered where rigorous monitoring is lacking, but also with huge potential for rapid improvement
The OEE formula integrates three essential dimensions:
- Availability – the time during which the equipment actually produces, compared to the planned time.
- Performance – the actual production speed compared to the ideal speed.
- Quality – the proportion of good parts out of the total produced.
Each of these dimensions can be improved through digitalization, using advanced MES and APS solutions to increase the overall efficiency of the production process.
The 6 major production losses that reduce efficiency
When OEE is low, the causes are often hidden in what Lean methodology calls the “six big losses”:
- 1. Unplanned downtime - equipment failures, material shortages, operator absences
- 2. Planned downtime - changeovers, scheduled maintenance, inspections
- 3. Micro-stoppages - brief interruptions lasting a few seconds that can accumulate into hours of lost time
- 4. Reduced speeds - equipment operating below capacity (due to wear, incorrect settings, or limited operator experience)
- 5. Production defects - rejected parts generated during the normal production flow
- 6. Startup defects - rejected parts generated immediately after a setup or changeover
How can you increase OEE with MES and APS solutions?
1. Increase resource availability and eliminate downtime
MES (Manufacturing Execution System) from Senior Software automatically collects data from equipment (PLCs, sensors) and operator reports, displaying in real time the causes of downtime (failures, material shortages, changeovers).
Through the Preventive and Corrective Maintenance modules, unplanned downtime can be significantly reduced, while KPIs such as MTTR (mean time to repair), MTBF (mean time between failures), and MTTF (mean time to failure) provide clear control over equipment availability.
At the same time, APS (Advanced Planning & Scheduling) optimizes production planning to minimize changeovers and setup adjustments.
Real results: A manufacturer that applied the “Minimize Overall Setup” rule in APS reduced total setup time from 3 days and 9 hours to just 1 day and 22 hours.
2. Improve performance through faster processes without compromises
Even when machines are running, they often operate below maximum capacity, while slow cycles and micro-stoppages represent subtle but highly costly causes of inefficiency.
The MES system monitors actual production times for each resource and compares them with ideal values, identifying slowdowns and stoppages, including those lasting only a few seconds. It also enables detailed analysis of alarms and technical causes, providing a complete view of operational efficiency.
At the same time, the APS software solution supports intelligent order sequencing and helps avoid bottlenecks caused by material shortages by planning based on real inventory levels and actual orders.
3. Ensure quality with fewer defects and better products
Another critical factor of OEE is product quality. Defects occurring during production or at startup not only lead to time losses but also involve material waste and additional costs.
Through the Quality module, the MES solution provides immediate feedback to operators and ensures full material traceability. As a result, defects are reduced, control is improved, and process parameters can be monitored in real time.
At the same time, the APS system plans production based on the availability of compliant materials, avoiding the use of non-conforming batches.
Result: Continuous workflows, fewer delays, and improved production times.
Concrete examples of OEE improvement
- Reduction of changeover times through intelligent rules in APS
- Elimination of unplanned downtime through preventive maintenance in MES
- Increase in quality through automated inspection modules and defect reporting
- Detection of micro-stoppages that can account for up to 15% of total production time
OEE, more than an indicator, a snapshot of efficiency
Want to see how OEE can be improved in your factory?
Discover how MES and APS solutions from Senior Software can help transform productivity into profit.