There is no single "ISTP socionics type." The two systems are cousins, not twins — so an ISTP lands on one of 3 socionics types, and only your answers can say which. The candidates and their starting weights, stated openly:
Most ISTPs land on SLI, the understated craftsman. LSI fits when strict systematizing dominates, and SLE fits when forceful engagement does.
The mechanical rule you'll see elsewhere — keep the letters, flip j/p for introverts — maps ISTP to LSI (socionics ISTj). It assumes the two systems measure the same four dichotomies the same way. They don't quite: socionics builds its types from eight function positions, MBTI from four letter preferences, and the correspondence between them is genuinely contested — which is why every ≈MBTI equivalence on this site carries an asterisk (method §1).
The conversion test treats your MBTI as evidence rather than an answer: ISTP opens the candidate set above, ~20 targeted questions decide between the candidates, and if your answers point somewhere else entirely, they overrule the starting point — with a warning that says so.
Your answers decide between SLI · LSI · SLE.
Take the 8-minute conversionWhichever candidate wins, the result is scored twice: MODEL A is the classical verdict; MODEL G is Gulenko's school reading the same answers as energy rather than information. When they split, you see the split — margins included, free. New to all of this? the basics →