I learned in childhood that anyone's view on something was an opinion, but that a good opinion was based on fact. By that, an informed stance is a good opinion.
As I've grown, I see there are other elements beyond fact, as well: Proper use of logic; trust of one's feelings; integration with one's values; evaluation according to ethical principles; proper use of multiple perspectives from different fields of studies and even different cultures: All these go into a well-informed opinion.
in forming a stance from an opinion, I think it is important to ask two more questions: Is my thinking really my own? That is, where I have taken ideas from others, have I truly evaluated them? And, how rigid is my stance? Am I open to listening and reconsidering? If my own presuppositions turn out to be wrong, or new information comes in, or I'm shown an error or unseen harmful consequence of my stance, would I change?
To me, answering all these questions allows us to develop a well-formed stance, and then be open to learning and growing further. People who do this are able to truly solve problems by working together to evolve a new level of thinking.