The expected crew safety reliability was assessed at 0.973 with a confidence level of 60 percent. Functional logic diagrams indicated the amount of redundancy in each CSM function. North American noted that a direct comparison should not be made between mission AS-506 lunar orbit rendezvous (LOR) crew safety reliability and the preliminary crew safety number 0.976 for spacecraft 012. The LOR assessment, while preliminary, was developed in greater depth than the assessment for the PSAC briefing. However, a real increase in reliability was indicated from spacecraft 012 to the LOR mission because the reliability values were about equal, and the complexity and number of required functions in the LOR were far greater.