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\section{Comparison to SSI Survey}  \label{sec:ssicompare}  Thiw work was inspired by a UK survey led by the Software Sustainability Institute. While their findings are for the wider scientific community in the UK and ours are for the worldwide astronomical community, a comparison is still interesting. 90\% of astronomers write some of software (93\% of UK astronomers). This is much larger than the SSI survey, which finds that only 56\% of researchers, across all disciplines, write some of their software. This implies astronomers are much more dependent on their own software than other sciences. In the SSI survey, 55\% of respondents say they have received some training in software development, with 40\% indicating that the training was a formal course and 15\% indicating self-directed study. Our categories are not identical, but we find that a similar fraction of astronomers - 57\% (53\% of UK astronomers) say that they have received some form of training. However, only 8\% say that the training was substantial, while 49\% say they received a little training. The decision what constitutes a lot and a little was left to the participants, but those who chose to expand on their decision indicated that a lot corresponded to a formal class while a little corresponded to using on-line materials such as Software Carpentry and Code Academy.