According to standard

Combination of all technical, administrative and managerial actions, intended to ameliorate the intrinsic reliability and/or maintainability and/or saftey of an object, without changing the original function.

For maintenance, this means all measures aimed at prolonging service life and eliminating future defects.

The purpose of an improvement could be to:

  • Eliminate defects
  • Extend MTTM
  • Improve safety
  • Improve MTTR
  • Improve maintainability


Improvement maintenance excludes measures aimed at improving the machinery in terms of speed and quality. The same applies to the adaption of equipment for a new product or new packaging. These measures are called Modifications.

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