controled and uncontrolled exoeriment

controlled and uncontrolled experiment is a very crucial step in project testing.

for example, in my project regarding information harvesting from atm machine, we have to set afew experiment to fully test the function.
controlled environment : attempt to harvest information with planned time frame. for example, every5 seconds.

uncontrolled environment : random pattern to attempt harvesting.
uncontrolled environment 2: randomly pick a colleague who know nothing about this project to perform the action without telling what he should expect .sometimes by doing this, we could accidentally found out other loophole that we've overlooked.