|Definition:|| probability of performing as required for the time interval (t1, t2), under given conditions
Note 1 to entry: Given conditions include aspects that affect reliability, such as: mode of operation; stress levels; environmental conditions; and maintenance, where applicable.
Note 2 to entry: It is usually assumed that the item is in a state to perform as required at the beginning of the time interval.
Note 3 to entry: When t1 = 0 and t2 = t, then R(0, t) is denoted simply as R(t) and termed the reliability function, or survival function of the item. See IEC 61703, Mathematical expressions for reliability, availability, maintainability and maintenance support terms, for more details.
Note 4 to entry: See also reliability, <of an item> (192-01-24).