Methodology

Item bank: OEJTS

The test uses items adapted from the Open Extended Jungian Type Scales (OEJTS) 1.2, an open-source MBTI alternative developed by Eric Jorgenson and published as part of the Open-Source Psychometrics Project. The OEJTS items are public domain. Jorgenson’s comparison study found OEJTS the most accurate of the major open-access MBTI alternatives.

Each item is a paired-pole prompt (e.g. “makes lists” vs “relies on memory”) answered on a 5-point scale. Pairing avoids the abstract self-rating trap of Likert agree/disagree items.

Question count

The test is 32 items, 8 per axis. Each of the four MBTI axes (Introvert/Extravert, iNtuitive/Sensing, Thinking/Feeling, Judging/Perceiving) gets 8 paired-pole prompts.

Scoring

Each item is scored on a 5-point Likert scale:

• 1 (← Left): +2 toward the left-pole letter.
• 2 (← leans): +1 toward the left-pole letter.
• 3 (Neutral): 0. No movement on this axis.
• 4 (leans →): +1 toward the right-pole letter.
• 5 (Right →): +2 toward the right-pole letter.

Maximum raw score per axis: 16 (8 items × 2 points).

Adaptive skipping

The test doesn’t always make you answer all 32 items. An axis is considered resolved and remaining items on it are skipped if any of the following is true:

• The other side of the axis can no longer mathematically catch up (the lead exceeds the maximum possible swing from remaining items).
• After 5 answered items on an axis, the lead is 8 points or more (equivalent to a 5-of-5 strong-direction streak).
• You answer “Neutral” three times in a row on the same axis and opt to skip the rest of that section when prompted.

In practice: clear-cut types finish in ~20 items. Mixed or near-the-middle types answer closer to 32.

Spectrum scoring

Most MBTI tests report a binary type (e.g. INTJ). We also report how confident each axis call is, so you know which letters are firm and which are close to the middle.

Formula, per axis:

confidence = round((winner_score - loser_score) / 16 * 100)
confidence = clamp(confidence, 1, 99)

Your result displays as: INTJ · I(74%) N(88%) T(61%) J(92%). That’s a firm INTJ on three axes and a borderline T/F call. If one axis is low-confidence, treat it as the letter most likely to flip on retake.

Confidence is never 0% or 100% — we clamp to 1–99 because no test is that certain. A 99% is as confident as we’ll ever claim.

How we differ from typical pop MBTI tests

• OEJTS items. We use a publicly validated item bank rather than home-grown items. OEJTS axis correlations with the official MBTI are roughly 0.62–0.81.
• Paired poles instead of agree/disagree. Most pop tests ask you to agree/disagree with abstract self-statements (“You feel at ease in a crowd”). We show two opposed traits and ask which leans closer to you. Comparison reduces self-concept inflation.
• Adaptive, not fixed-length. Most tests make you answer all items regardless. We stop asking about an axis once it’s resolved, saving items for clear types while keeping rigor available for ambiguous types.
• “Neutral” is a real option. Three Neutrals in a row on the same axis triggers a prompt to skip that section entirely.
• Spectrum scoring, not just type code. We show axis-by-axis confidence so you can see where your call is firm versus where you’re near the midpoint.

Limitations and honest caveats

MBTI is a useful framework, not a scientific classification. The four-letter code captures real patterns in how people think and behave, but individuals don’t fit cleanly into 16 boxes. Any single type description will feel partially wrong. Use MBTI as a lens for self-reflection and communication, not a personality verdict.

Your type is a signal for fit, not a cap on ability. A type can tell you which environments will feel natural and which will drain you — but plenty of people thrive in careers that don’t match their textbook profile, because individual drive, skill, and circumstance matter more than any archetype. Type informs, it doesn’t decide.

If you want a more scientifically defensible personality measurement, look at the Five-Factor Model (Big Five). But MBTI is a better shared vocabulary for conversations about how you work and relate, and that’s what this site is for.

References

The MBTI framework is based on the work of Isabel Briggs Myers and Katharine Cook Briggs, drawing on Carl Jung’s theory of psychological types. We treat MBTI as a useful behavioral lens, not a clinical instrument; the Five-Factor Model (Big Five) has stronger empirical support for personality measurement.

• Myers, I. B., & McCaulley, M. H. (1985). Manual: A Guide to the Development and Use of the Myers-Briggs Type Indicator. Consulting Psychologists Press.
• Jung, C. G. (1921/1971). Psychological Types (H. G. Baynes, Trans.; revised by R. F. C. Hull). Princeton University Press.
• McCrae, R. R., & Costa, P. T. (1989). Reinterpreting the Myers-Briggs Type Indicator from the perspective of the Five-Factor Model of personality. Journal of Personality, 57(1), 17–40. doi:10.1111/j.1467-6494.1989.tb00759.x
• Pittenger, D. J. (2005). Cautionary comments regarding the Myers-Briggs Type Indicator. Consulting Psychology Journal: Practice and Research, 57(3), 210–221. doi:10.1037/1065-9293.57.3.210
• Goldberg, L. R. (1990). An alternative “description of personality”: The Big-Five factor structure. Journal of Personality and Social Psychology, 59(6), 1216–1229. doi:10.1037/0022-3514.59.6.1216