Click on the image...
No doubt the people would not like my approach, but if they cooperated I'd be able to get to the heart of these things a lot better than the UFO investigators out there now.
Near as I can tell they only ask people what they saw and get details of the witness's account. Maybe take measurements, etc.
But there is a lot more to the entire phenomena than can be understood by merely interviewing eyewitnesses. Many questions need to be asked (including many which would seem irrelevant or impertinent to the witness) if anyone is ever going to get to the truth of the matter.