Выражение встречается в следующем контексте:

short:
• Improved plant efficiency by improving control variability

full:

It is expected that the resulting recommendations, once implemented, will result in significant benefits to THE COMPANY. These benefits will arise from:
• Reduction of downtime of process and equipment and resulting production loss, by improving the reliability of the safety logic and alarm management practices.
• Increase energy efficiency and ability to maximize plant throughput, by improving the control strategies of key process units and reducing variability.
• Improved plant efficiency by improving control variability
• Improved product yield by optimizing the operation of the reformers and the synthesis reactors
• Improve environmental performance by reducing flaring and other unnecessary releases to the environment
• Improved process and control system performance monitoring by implementing relevant recommendations

Заранее спасибо