MAINTENANCE MANAGEMENT SYSTEM is a program of planned maintenance activities to avoid accidents and breakdowns. Preventive maintenance's primary objective is to discourage machinery from failing before it actually occurs. It is designed to preserve and enhance the reliability of the equipment by removing damaged components until they malfunction.

Overall Equipment Effectiveness is a measure of how well a manufacturing operation is utilized compared to its full potential, during the periods when it is scheduled to run. It identifies the percentage of manufacturing time that is truly productive

Tool life refers to the useful life of a machine tool. It can be expressed in the amount of good parts that a given tool is capable of machining. Once a tool is worn to the point that the parts being created are out of spec, it's life is effectively over and the tool should be replaced.

There are now many hundreds of examples of industrial and other organizations that have significantly improved their energy performance through the implementation of an EMS.