How to decide?
If you have a decision to make, the most efficient number of variables is likely to be two: Should I turn left or right?
--David Rock
How to decide?
Ask the people who did that already if they would do it again if they could re-decide. You'll get much more wider answer then, by asking if to do the same thing or not, as people tend to make others decide for what they decided for.
--unknown source