National Aeronautics and Space Administration (NASA). This Technical Standard approved by NASA 05.07, 2013 . Superseding NASA-STD-8719.13B. 57 p. The purpose of this Standard is to define the requirements to implement a systematic approach to software safety as an integral part of system safety and the overall safety program of a program, project, or facility. This Standard specifies the software activities, data, and documentation necessary for the acquisition and development of software in a safety critical system. These activities may be performed by a collaboration of various personnel in the program, project, or facility, and Safety and Mission Assurance (SMA) organizations. Safety critical systems that include software are evaluated for software’s contribution to the safety of the system during the concept phase, and repeated at each major milestone as the design matures.