[bduerst]

A/B testing seems to be the industry standard it seems, at least when making changes from in-house designers. It's becoming more a of a science, with the hypotheses based on art and design.

A good rule of thumb: If you can't give a definitive % increase in actions, conversions, etc., then you probably shouldn't be submitting the change.

[seestheday]

Not the standard for a surprising number of very large companies or very large digital agencies.

It should be, but in my experience this is not the case.