https://shcpub.in/index.php/cm Sacred Heart Research Publications en-US Journal of Computational Mathematica 2456-8686 https://shcpub.in/index.php/cm/article/view/449 <p>In this paper, we consider on a multistate degenerative system with k working states and <em>l</em>-failure states and study the maintenance problems under various bivariate replacement polices (<em>T, N</em>)<em>,</em>(<em>T </em>+<em>, N</em>)<em>,</em>(<em>U, N</em>)<em>,</em>(<em>U </em><em>−</em><em>, N</em>). The long-run average cost of a multistate degenerative system is calculated. Under the afore-mentioned bivariate replacement policies under partial product process optimality in inferred. In this study, the results developed are strengthened with numerical examples.</p> Affan Ahmed J Govindaraju P Rizwan U Mohamed Ali A Copyright (c) 2026 2026-01-13 2026-01-13 10 1 1 24 10.26524/cm223