“…For a consumer durable product, warranty cost is an indispensable cost. Several papers acknowledged the importance of warranty cost while designing LTSPs under usage stress (Kwon, 1996; Huang et al ., 2008; Tsai et al ., 2008; Hsieh and Lu, 2013; Tsai et al ., 2015; Chakrabarty et al ., 2020a, b, etc.). But to the best of our knowledge, no paper so far has included warranty cost while designing LTSPs under accelerated life test setting.…”