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Interest level also tells you what she's up for. If she's actually interested and not just bored, asking her on crappy dates is more effective. Because a girl who's not really into you, will not come over to your place to watch a movie, cook, or play assassin's creed. But she might go to a concert with you.
One good mental test I created. Ask yourself the following "If a random, but average dude, asked me if I wanted to do this with him, for free[whatever his reason, you're not afraid he's trying to murder/rape you, etc]; would you say yes? If so, the date is too cool to take a woman on, the first time. Invite her to something more lame.
The sole exception being inviting a girl who's only mildly interested to a cool party with you. Yes, she may make out with some other dude, but your odds improve a lot if you handle it right.
Do you not prefer to just keep it as a mystery to the girl? Take her to numerous places in one night: First go and play some pool to get the banter going and get familiar with eachother, then go and have some fun in the arcade, then go and get something to eat... maybe go see a movie after it all... you get the idea.
Makes her feel like she knows you better than she does, cause it's like multiple dates in one night, plus she never knew what was going to happen, it was like a little fairytale right before her eyes

(y'know what women are like, they love that shit) you get less flakes when you don't tell them your plans.