Description: Percentage in a period where the object has fulfilled the function; Name: availability in relation to time
Description: During a given period of time, percentage of the time during which an item was able to perform when required ; Name: Time based availability
Description: extent of protection provided by an enclosure against access to hazardous parts, against ingress of solid foreign objects and/or ingress of water and verified by standardized test methods, expressed as a IP rating; Name: degree of protection