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Overall Performance Index
It represents the level of exploitation of a certain technical system. The Overall Performance Index is a ratio between the actual performance expressed by the technical system in an industrial process and the maximum potential of the technical system (e.g. as measured in laboratories). An Overall Performance Index equal to 100% means that the technical system is exploited to its full potential. Lower values mean that the technology can be further exploited, but for some reasons it does not happen (e.g. because of the emergence of undesired side effects, excessive consumption of resources, …)