The Hawthorne effect: An old scientists’ tale lingering “in the gunsmoke of academic snipers” | Absolutely Maybe, Scientific American Blog Network | Creative teaching and learning | Scoop.it
From blogs.scientificamerican.com - July 26, 2013 11:19 AM

"It’s easy to see a “cause and effect” relationship where there isn’t one. Or overlook one that should be as plain as daylight...."