Moreover, such study won't happen, because so many of the effective methods are seen as controversial. No confrontational approach would be ever sanctioned by any licensed professional, even if they are the most useful means in practice.
Oh, I so agree with this. So many people out there don't agree with snooping. Even gathering publicly available information is considered snooping by some people.
I also think that everyone is different and situations are different. My exH had an exit affair so I'm satisfied in thinking nothing would have changed. I did enjoy pissing the other woman off though.
In my current situation, I think my timing was really good. My fiance offered to send his EA no contact letter AFTER I showed him evidence that he was treating not only better than a friend but better than he was treating me.
I turned down the offer because I felt that he was contacting her as much she him so I had much preferred to see him stop contacting her first and then only if she didn't stop contacting him, would an NC letter be necessary.
Well, 3 weeks later, the bf of his so called good friend waited until the day of her birthday to send him an invitation by FB private message. And then at 11pm when the pub was closing, she texted my fiance asking "Why didn't you come?" I said, yeah, great she's such a good friend and she really treats you like one. After that he steadily made the effort to cut off contact with her, ie defiended her on FB and so on.
I think all these tactics, techniques need to be weighed up for the individual situation. Posters should give feedback on what happened and whether they're happy with the results.
Who needs an expensive study after that?