“…One of the important advantages of the models is that they usually do not use any prior assumptions and are based only on fault history data. Many non-parametric SRGMs have been proposed in the literature [2,3,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]. Contributions to this field are continuing, For example, Barghout [22] presented a new non-parametric model which is based on the idea of separation of concern between the long term trend in reliability growth and the local behaviour.…”