It seems that for introverts (but not for extroverts!) there is no simple translation from MBTI J/P to socionics j/p:
http://en.wikipedia.org/wiki/Socionics (please have a look under header 16 types)
Does anyone here have any clue as to why that is the case?
There is also a fifth dimension (neuroticism, cf Big Five) which each system only partially covers/reaches. This is perhaps covered better in the enneagram level of health.
That is, four dimensions are used, but the coordinate axes of MBTI and Socionics are not perfectly aligned, and they cannot of course cover all five dimensions of Big Five (and do not align with their axes either).
For example, is it possible to say anything on which of the eight functions that are most difficult to translate between MBTI and Socionics, i.e. where is the correspondence weakest in the table below? (numbers in parenthesis correspond to typical table entries in Socionics)
MBTI/Beebe Socionics 1 Dominant/Hero Leading (1) 2 Auxiliary/Good parent Creative (2) 3 Tertiary/Puer-Puella Mobilizing (6) 4 Inferior/Anima-Animus Suggestive (5) 5 -/Opposing Observant (7) 6 -/Senex-Witch Demonstrative (8) 7 -/Trickster Vulnerable (4) 8 -/Demon(Daimon) Role (3)
Edit: The four dimensions I'm talking about above would perhaps correspond to
Ji (some mix of Fi and Ti),
Je (some mix of Fe and Te),
Pi (some mix of Ni and Si) and
Pe (some mix of Ne and Se).
It's a mess.
Edit: Another four-dimensional basis is of course
Just to complicate things even further...