Re: cad filtering. I agree with several posters that the most fair system would have low-investment, conversation-rich daytime meetings (coffeehouse, perhaps wine bar) be the norm for the first several meetings. The man is not being asked to commit much in the way of money or sexual opportunity costs, since his evenings remain free; the woman is not being asked to commit in the way of giving sexual access, since these dates take place during the day and (usually) have well-defined endings.
I don’t know how long this process should take; it would appear to need to go on for enough time for the man to have enough information to decide if he wants to date the woman exclusively and for the woman to decide if she wants to sleep with the man. I would think that, after a few meetings like this, a woman would want to know the basic outline of the guy’s background and major interests, determine if he is generally positive or negative to be around, see how he treats other people (i.e., waitstaff) and talks about people who are not present, and be able to accurately place the guy on, say, Fisher’s taxonomy of dating personality types. This can probably be done through open-ended, indirect field interview questions embedded within the normal flow of conversation (i.e., not an interrogation), but that could be the subject of another thread.