Lorenzo Sewanan Posted almost 3 years ago Tim Harford: Trial, error and the God complex I agree with this talk completely. This is how real engineering is done, trial and error. Parameters are tried until they are optimized. This said, however, the initial thing that is tried out is not usually something random; that is based upon careful design. And, modifications to the item keeps being modified through design principles, not a random selection. So, trial and error works, but obviously, random tries at making things would not work (which I'm not sure Tim really understood).