It stems from Expressive Therapy, the notion that through expression, we are well on the way to dealing with our past.
It’s also based on NLP techniques to help de-traumatize one still trapped in the thralls of major trauma. The technique is to offer a buffer zone, a safe distancing from past events in our lives in order to view them as if we were watching a movie.
This is also psychodrama, a technique that offers us the opportunity to recreate life events as if we were directing theatre. We cast important characters in the scene, including ourselves, and we coach them in saying the sentences as we recall them being said. We position them just as they were at the time. We direct the scene, write the script, and do coaching to make sure that the events are portrayed as they need to be.
Then, if need be, we can zoom into a moment, expand it, slow it down. We can even rearrange characters, re-write the script, so that we can experience the satisfaction of closure. With understanding and often a big smile, we are free to move on.
Each of these techniques offer the storyteller a way to deal with personal history.