I favor open code, but like everything, there are issues. For example, the EPA years ago required that research can only inform policy when data is open; open d

I favor open code, but like everything, there are issues. For example, the EPA years ago required that research can only inform policy when data is open; open data, however, takes a lot of effort to document and provide. Companies, however, with vested interest in EPA policy can easily produce open (and often very biased) data. Requirements for open code can lead to similar issues—what happens when a government agency rejects the outcome of a supercomputer simulation because the code wasn't documented well enough? What happens when those with vested interests are the ones best able to produce scientific code? Scientists already wear many hats. Any shift in policy and norms needs to consider that they have limited time, a fact that can have far-reaching consequences.