“…Goel and Okumoto [26], Littlewood [44,45], Yamada et al [90], Musa and Okumoto [53], Ohba [58], Goel [25], Laprie et al [43] and Gokhale and Trivedi [27] presented typical NHPP-based SRMs. Even in recent years, many researchers still proposed NHPP-based SRMs with different mean value functions under different modeling scenarios such as imperfect debugging, change points, testing efforts and fault correction process [30,32,64,73,88]. …”