Glossary

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Term	Meaning
Performance	Efficiency of a system; indicating how well the system works.1 1 Efficiency of a system with regard to structural behaviour is referred to as structural performance
Predetermined maintenance	Preventive maintenance carried out in accordance with established intervals of time or number of units of use but without previous condition investigation, and entails a component being replaced after a certain calendar time, period of use or number of times being put into use.
Predictive maintenance	An expansion of the condition based maintenance which includes a combination of condition monitoring and/or inspection and/or testing, analysis and the ensuing maintenance actions, and entails prescribed criteria related to one (or more) condition thresholds to enable decisions about interventions based on a forecast derived from repeated analysis or known characteristics and evaluation of the significant parameters of the degradation of the item.
Preventive maintenance	Maintenance carried out either at predetermined intervals or according to prescribed criteria, which is intended to reduce the probability of failure and/or the degradation of the functioning of an item.
Probability	Quantitative measure of likelihood (i.e. the chance of occurrence in a specific time period) expressed as a number between 0 and1, where 0 is impossibility and1 is absolute certain.