Following the answer of @Cyn and my comment (on Doubt about a particular point of view on how to do character creation ): I would like to know more about how to "know" more about a true alived character. Now, if you think a little bit, the one will find a particular point of view that is tricky, I mean, say for sure what is an action wrote for an character and what is an action did by them.
I'll give you an feeble example: A character walking down the street sees a person asking for help, because this person needs to find a public telephone to talk about a urgent situaton. Then I "observe" my character actions and I conclude that this character helped indeed this person.
This example illustrates, at some level, what means "put your character in a situation". I gived my character the possibility to deny a help and say no; my character choosed to help. But the outcome of this situation is something that I imagined, I mean, is my mind. How can I know that my character's choose was a some sort of "independent thought" if I've imagined that outcome?