The scientific method is a standard logical approach to problems, and therefore it's commonly used even for decisions not made based on empirical evidence. For example, when I was making the decision last year to graduate early, I used the scientific method.
I identified the problem that I wasn't happy in school and that my classes were mostly unchallenging. Because of this, I decided to research solutions and discovered that I'd taken enough class requirements to graduate in one more year instead of two, with a little work. After some thought, I predicted that this would solve my problem by making my course load more difficult or by at least making the time spent in class shorter.
In this particular decision, I'm hovering around the next two steps--the school year has only just begun, so I suppose I'm technically experimenting with early graduation. But even so I can begin to analyze the situation and conclude that so far I'm finding a few of my classes more challenging, a few of them less so, and that I still have enough trouble with certain aspects of high school to want to leave a year early at all costs.
And I'm communicating my results right now, via this blog post.