Typology theory guides
Function-level explanations you can read before or after you take the assessment.
TypologyTesting.com publishes original theory content alongside our free cognitive function assessments. These guides explain how each of the eight functions works, how they sit in a stack, and how the sixteen types differ at the level of functions, not slogans.
We write for readers who already know the four-letter codes and for people who are new but willing to learn the vocabulary. Every guide ties back to the same measurement model we use in the assessment: calibrated items, open methodology, and results you can inspect.
Start with the Briggs-Myers cognitive function school below, then follow the pillar links for functions, types, and stack positions.
Last updated: May 2026
Briggs-Myers cognitive functions
Our published theory library today centers on Jungian function-attitudes, stack positions, and quadrant dynamics. Additional typology schools may be added later when they meet the same editorial standard.
Core cognitive functions, positions, quadrants, and dynamics. Explore a modern framework for function-level understanding.