Hi, glad you found your way here; technically the thread is in the incorrect subforum (this is more for technical website issues) so will be moved, and then the URL will change and a new one provided...don't be surprised, it may look like it's been deleted but it hasn't, just moved.
That said, I didn't instantly recognise SET - but google-fu shows
https://peoplepsych.com/support-empathy-truth-set-for-borderline-personality/ which says "SET stands for SUPPORT, EMPATHY, and TRUTH. It was developed by Jerold J. Kreisman, MD, and Hal Straus, the authors of I Hate You, Don’t Leave Me and Sometimes I Act Crazy." Technically I wasn't a large fan of that book-set as I found them overly conciliatory - and while the pwBPD who gave them to me was a fan of the "flattering" description of techniques, etc - they didn't seem to actually work. That said, of course every case is slightly different - so I'm not saying it's a bad system, just that in my experience the Kreisman/Straus methods were a little too feel-good. Then again, I'm also a relatively strong critic of Marsha Linehan - so maybe I'm just overly critical. (I criticise Kreger's lack of depth in writing, but her actual analysis of BPD seems legit).
Personally I'll always ship/cheer Kernberg and Lawson as the best insights without pulling any punches, though it may be that I lean towards the Austrian school as the methods are more Freudian (in the real sense, not the "do yoga and picture yourself as a lotus flower emerging while you're in your mother's bed" sense that one professional in our family's life has recently attempted to my strong condemnation).