The efficient management of the performance and reliability factors of safety critical systems (SCSs) may optimize system’s performability and hence improve the quality of the SCSs. A review work is done on performability analysis of safety critical systems. The primary aim of the study is to investigates the existing approaches of performability evaluation of SCSs and find out the strengths and limitations of the performability approaches. Different performability parameters are examined and various critical challenges are pointed out. It is also important to know that how the researchers defined the term “performability” in the literature. Several review work visible in the literature deals with performance and reliability issues separately. In this work, an attempt has been made to understand the comprehensive picture of performance and reliability factors in a combined manner. The given review is the most contemporary as it includes studies published from 2011 to 2019. Some earlier studies are also included based on their relevance. Identifying the different scenarios of performability and purposeful classification of performability parameters are the major achievement of the review. The obtained results will enable academicians and novice researchers to make effective decision on performability of SCSs.

对安全关键系统（SCS）的性能和可靠性因素的有效管理可以优化系统的性能，从而提高SCS的质量。已对安全关键系统的性能分析进行了审查。这项研究的主要目的是研究SCS的性能评估的现有方法，并找出性能方法的优势和局限性。检查了不同的性能参数，并指出了各种关键挑战。同样重要的是要知道研究人员如何在文献中定义术语“性能”。文献中可见的一些审查工作分别涉及性能和可靠性问题。在这项工作中 试图以综合的方式了解性能和可靠性因素的综合情况。所提供的评论是最现代的，因为它包括2011年至2019年发表的研究。根据其相关性，还包括一些更早的研究。识别性能的不同场景以及对性能参数进行有目的的分类是该审查的主要成果。获得的结果将使院士和新手研究人员能够对SCS的性能做出有效的决策。识别性能的不同场景以及对性能参数进行有目的的分类是该审查的主要成果。获得的结果将使院士和新手研究人员能够对SCS的性能做出有效的决策。识别性能的不同场景以及对性能参数进行有目的的分类是该审查的主要成果。获得的结果将使院士和新手研究人员能够对SCS的性能做出有效的决策。