I learned about the “controlled environment” concept in the zombie movies, where they show some kind of virus or disease spreading around the world and everything becoming mayhem because something wrong happened with the controlled environment where the virus was being tested and stored.
According to the Oxford dictionary, a controlled environment is an environment which is artificially regulated to ensure conditions such as temperature, air quality, etc., remain stable; the condition or state of such an environment.
So it’s basically a context where you can control variables to see the outcome of an experiment, and how that outcome changes if you change a variable.
The interesting thing is that we can apply this concept to anything we want. We can make experiments in any context we want.