I have learned so much from Ross Jeffries, but Observe and Use has helped me talk to girls more than anything else. It makes cold openers easy. Now Ross says his best ideas come from his intuition - that may be true. But I think it is truer to say that he is great at induction - DEFINITION:(Philos.) The act or process of reasoning from a part to a whole, from particulars to generals, or from the individual to the universal; also, the result or inference so reached.
What this means is simple. Ross surveys the situation/girl very quickly, picks out certain things that are important/active in what is going on in the said situation and USES IT in his approach.

What a difference this has made for me. I am still learning and getting quicker. With OAU, I don't always have to challenge myself with the 3 second rule (situation permitting of course).

I OBSERVE - I take in as much info as possible, think about how I could approach her USING that info and approach. Here are a couple of recent examples:

Girls on Train : Two girls were on the train, swearing, cursing and talking dirty.
Me : I guess girls do talk as dirty as guys
Her : Laughing - idle witty back and forth banter.
Me : it is too bad we don't have more time, I would like to analyze your handwriting.
Her : Really? You do that? More banter
Me : Well, it is just a hobby.

I feel with the above situation, a cold walkup is pretty difficult. These girls were younger and I didn't have much in common - on the surface. But discovering something about the situation not only paced their reality, but lead me into a situation where I could talk to them.

Girls with her Mother: the mother was trying to warm her daughter by rubbing her arms.
Me : Come on, it is not that cold!
Mother : Laughing. Yes it is!
Daughter : Laughing herself - idle banter

A mother and daughter! Easy as pie. I looked at the situation, picked out what I could use and went for it.