In the case of standing in public and attempting to stop passers-by to complete a short questionnaire, what is your basic approach? In a previous life, I was a commission salesman, so I know how important it is to make the first utterance out of your mouth the right one if you want people to give you even two seconds of their time, so what tends to work best for collecting data for research? A yes-no question? An open-ended question? A statement about the weather? Asking if they have a couple minutes vs avoiding mentioning time? Here have been some of my attempts, but it's hard to gauge which works best with the few attempts I've made:
(For specifics on my current survey, it's a bunch of Likert scale questions aimed at getting opinions about bilingual signage in a small town. I'm standing in front of grocery stores to encounter people as there really aren't any other places with regular foot traffic.)