Recently I found this article on wikipedia
https://en.wikipedia.org/wiki/Self-expansion_model
And it seems to have some overlap with Socionics.
Some simple examples from this article:
1. "The second principle is that individuals often achieve self-expansion through close relationships which allow the inclusion of the other in the self"
is the same as the personality blurring effect described as a result of dual relationships (but not only those of course).
2. "Self-expansion is not consciously motivated"
Just as the ideia of dual seeking and HA functions.
3. "People who are most similar to ourselves provide a diminished capacity for self-expansion"
Like mirrors and Identicals are less effective than duals and activators for self-expansion
4. Also some article states that We are attracted not only to different people, but especially those who are similar to our ideal self (probably a dual for those who have interacted with one on a close level) and hold the same values.
5. "people may be fearful of creating a close relationship with an outgroup member as this may trigger animosity from original ingroup members."
I thinks this somehow relates to clubs and quadras
But this model seems too generic to me, and absolutely vague compared to Socionics.
What do you think about it? Did you know about this model?