We had classes together a year ago, we never talked then. Now I have her again. She recognized me. I talked to her once, for a while. We aren't friends. I saw her facebook, she is single. How do I get her number? HThe problem is I only see her once a week, (thats when my class meets), and we work in separate groups. Any ideas?

I am thinking, the next time I see her, I tell her taht I need a female perspective on one of my friends problem. (My friend can't approach girls). Next I want to smoothly go into getting her number. How do I do that? So, 2 problems are: 1) we aren't friends, although I talked to her once or twice for a while, and 2) I only see her once a week.

What can I do?

you have to start with something thats the first step!
Advice: don't search for her info or you'll get addicted to her, live the moment, don't put too much in it : )

I find out your idea not bad at all, but are you going to tell her that your friend can't approach girls? And if she starts to thing that you are talking about yourself?
Can't you get a real situation, like a friend that don't know what to give to his girlfriend. If you don't remember any, then make it up, use this one.

Attention you have to know how to get out of that topic and start to talk about her and what she do, and stuff, or otherwise you'll get stuck.

Oh avoid boring topics like: Oh we add class 1year ago you were a great student... try to focus on the actual situation not on the past...

about the number... make a funny excuse to get her number!
Don't ever, ever, ever ever! ask her number, like: Can i have your number? You don't ask you make an excuse to have it, if you ask, you are giving her the opportunity to say no.

I'm a lit tired and that's why i got just a few ideas about what's really important.
I recommend you watch some youtube guys and download some videos over internet and watch them all while you're watching them make notes and study them after.
You have to practice a lot, don't get that excited about it on the first days because you'll get some bad results but this make part of the entire process : )

You have some very good points. But I really need to know how to go from my friends problem into speaking about her and herself? How do I make a strong connection with her, that next time I call her she would go out with me. How do I make the transition?
Also, this is how I want her number. I will tell her, that you are good advice giver, and if my friend is having any problem, I know exactly who I should ask. I gotta to now, but give me your number, so that we can keep in touch.

don't do what you are planning, that sounds like a shitty opener, just go say ''hey, I noticed you in class and have never talked to you, why is that?'' then start a conversation with her, don't tell some random stupid story about how your friend sucks with girls, this will just make you seem like you hang out with un-cool people and by default will make you seem less cool

talk to her, if you don't ever have time to accomplish this, then you have to get your point accross fast, but you would be better off having time to talk to her in person, see if she is willing to open up to you, show a real interest in her, think of this in terms of the more she talks about herself the more she will feel connected to you, if she won't open up, you go first, tell her some cool stories from your life that are interesting, or make her laugh or tease her, what ever suites your personality, just try to have fun, if you are thinking that the conversation sucks, just make it a better conversation

finally what you do is instead of asking for her number, ask her out to do something, she either says no or yes, the number comes as a result of her saying yes to hanging out, if she says no, just talk to her again in another class, at another time, you can try as much as you want, but if you notice a pattern of her always saying no, and she never wants to hang out, then she is most likely not interested in you

also be honest about why you want to hang out with her if she asks, if she says why or what ever, don't say dur da dur... I want your number cause of.... uhhh (random excuse that isn't because you like her), just qualify her, ''you seem really cool, I'd love to hang out with you, why elese?'', if she ever corners you, just be honest, casual and laid back, just like it is totally normal for you and you meet new people and hang out with them all the time, the worst she can do is not be willing to hang out with you and have sex, and that would put you in the same position you are currently in... so really nothing is lost, you only have potential to gain something, and if she is not interested, who cares, she just saved you some time and you can go ask other girls out

GOOD LUCK

This looks like a very good plan. I plan to ask her to have a drink with me, not like a date, but a casual one. But, since we have labs, and we work in two separate groups. Each group leaves when their work is done, without waiting for anyone else. Should I tell her to drink with me before our lab or after? Chances are if her group finishes with her lab, they will leave before my group. What should I do?