I am sure you are aware of the philosophical problem about a tree falling in a forest; if there is no one there to hear it, does it make a sound? Which amounts to the issue of if we don’t experience something then how do we know if it has happened. I propose the same thing applies to benefits arising from a change.
I have been reviewing some work this week and found the authors promoting a concept known as the Hawthorne Effect (of which more later). I read an article in the Economist in 2009 which pulled the rug from the whole concept of the Hawthorne Effect and underlined the danger of extrapolating a generic concept from a single instance. click for more