I see that some guys really are not so sophisticated in approaching girls. Well i can say that approaching girls is really an art.
You can not be mathemtical about it. I mean you can make a sytem for approaching girl. But well you see even this system has many variations and improvisations in it.
I mean, my point is that you really can read stuff and make a system and then approach girl.
Approaching girls happens in the momnet. It is a skill of improvising and charm. Good luck to you if you are beggining to play it. I love this game.