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The Mission-Critical versus Safety- Critical software section explains the difference between two important classes of software: safety- critical software involving the potential for loss of life due to software failure and mission-critical software involving the potential for aborting a mission due to software failure. The Standards for Safety- Critical Aerospace Software section lists and describes current standards including NASA standards and RTCA DO-178B. The introduction contains aerospace industry definitions of safety and safety- critical software, as well as, the current rationale for certification of safety- critical software. Researchers and software developers can use this guide to jumpstart their understanding of how to get new or enhanced software onboard an aircraft or spacecraft. This document is a quick reference guide with an overview of the processes required to certify safety- critical and mission-critical flight software at selected NASA centers and the FAA. Certification Processes for Safety- Critical and Mission-Critical Aerospace Software