The 65-item National Aeronautics and Space Administration survey was conducted by the Johnson Space Center, which collected responses through a Web-based system in September and October. Overall, 118 of NASA's 129 astronauts and flight surgeons responded for a combined response rate of 91 percent.

The astronauts and flight surgeons reported a high degree of honesty and comfort in their relationships with each other. In questions about safety responsibilities, 61 percent of astronauts reported having personal experience in raising concerns about flight safety, crew performance or suitability for flight.

Both groups said they knew how to report safety concerns, and that they did not fear retribution when making such reports.

In questions about performance feedback, NASA said the astronauts reported receiving yearly appraisals that were understandable, fair and useful.

Finally, in questions about the use of alcohol, astronauts "strongly agreed" they fully understood NASA policies about alcohol use. Further, none of the respondents reported ever witnessing a crew member consume alcohol on launch day or during the time leading to launch.

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