Possibly off-topic, but I couldn't help noticing that this post is from the blog of a Ruby consultancy. Has anyone else noticed a correlation between the Ruby users and this kind of emphasis on acceptance criteria and acceptance tests? I learned how to think of development from this perspective and write Cucumber tests (in Ruby) from the same friend that got me into Ruby in the first place.
My experience concurs. I've worked in Ruby shops and many other types. I always assumed it was Rail's emphasis on testing and the popularity of Cucumber.
¯\_(ツ)_/¯