The Insight Game tests its accuracy in public, not behind closed doors. Here's what the data shows — updated live, with every game played.
Dr. Martine J. RoBards developed and refined the original physical card sort over 30 years of clinical use, with approximately 50,000 copies distributed between 1987 and 2005. Her original validation data is archived on her legacy page. This digital version rebuilds her card sort for the web, and we're testing whether the format translates — at internet scale, in public. Players who already know their MBTI type play the game and we compare. No cherry-picking. No hidden data. Every game counts.
The MBTI's own test-retest reliability is typically cited at 75-90%. Our accuracy rate reflects first-attempt matches against self-reported known types — a stricter standard than test-retest, since it measures agreement between two different instruments.
Intuitive-Feeling types (NFs — what Dr. RoBards called EMPATHISTs) consistently type at the highest accuracy. Sensing-Perceiving types (REALISTs) are the hardest to capture with card language. SPs are the hardest to type with the current digital version of the cards. Dr. RoBards worked specifically to address S/N bias in the original card language, but the gap tells us the S/N and J/P dimensions still need refinement — especially for Sensor-Perceiver types.
This doesn't mean the game fails for Sensors — it means the digital format may have introduced friction that wasn't present in the original in-person card sort. Dr. RoBards refined the S/N and J/P card language over decades of face-to-face use, where she could observe how clients interpreted each card. Without that context, some cards may land differently on screen. Community feedback is actively shaping these revisions.
The Thinking/Feeling dimension produces the tightest average margins of any round — meaning players are most evenly split on these cards. Community feedback from r/INTP, r/INTJ, and r/Enneagram has confirmed what the data suggests: some T/F cards describe extraverted feeling (Fe) more than introverted feeling (Fi). A person with strong Fi may not recognize themselves in language designed around Fe.
This is the most active area of card revision. Multiple known-type Thinkers have reported that the T/F cards were the round that felt most uncertain — and the data shows they're right. When the margin is 5-4, the instrument is telling us something about its own limitations, not about the player.
When your score on a dimension is 5-4 or 6-3, the game flags it as a "close round." This isn't a measurement failure — it's useful information about you. A close T/F round might mean your Thinking and Feeling functions are more balanced than most people with your type, which affects how you make decisions in relationships and at work.
Dr. RoBards' original profiles describe how each type behaves when their preferences are strong versus moderate. Close rounds connect directly to the nuances she documented — the INFP whose T/F is close may present very differently in a work environment than one with a strong F preference. This is why the AI report system uses close-round data to personalize recommendations.
The most common mistype patterns in the data are J/P flips (8 instances — ESTJ→ESTP, ENTJ→ENTP) and S/N flips (6 instances — INFJ→ISFJ, INTJ→ISTJ). The J/P dimension is the single biggest source of mistyping, not S/N or T/F.
Two patterns are emerging. First: the J/P cards describe lifestyle preferences ("Do you make lists?") rather than cognitive processes (Te/Fe vs Ti/Fi). An ESTJ who delegates organization to Instacart still has dominant Te — they just express their Judging preference through efficiency, not checklists. Second: some S/N card descriptions conflate following instructions with Sensing preference. An INFJ who values structure may pick the Sensing card because it describes their behavior — even though their cognitive process is Introverted Intuition, not Introverted Sensing.
These findings have led to active revision of both J/P and S/N cards, informed by known-type players from r/ENTJ, r/ISTP, r/INTJ, and r/INFJ who reported these exact experiences. The ESTJ and ENTJ accuracy rates (50%) represent the game's most significant weakness and our highest-priority fix.
Play the game and — if you already know your type — tell us. Every known-type game helps us find weak cards and improve the game for everyone.
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The Insight Game uses a forced-choice card-sorting method designed by Dr. Martine J. RoBards, Ph.D. — 36 paired descriptions across 4 rounds (E/I, S/N, T/F, J/P), 9 cards per round. The card language was developed and refined over three decades of clinical use with real clients, not generated by AI or adapted from other instruments. Players choose which description sounds more like them. The winning letter in each round determines the type.
Accuracy is measured by comparing the game's type result against a player's self-reported known type. Only players who voluntarily indicate they already know their MBTI type are included in accuracy calculations. No type verification is performed beyond self-report — the same standard used in most MBTI studies.
All data updates live. No games are excluded from the total count. Accuracy calculations use only the subset of players who self-report a known MBTI type — typically 20-25% of all players. Card feedback from known-type players is collected and used to revise card language on an ongoing basis. This is crowdsourced improvement — every game makes the cards better.
Self-report baseline: We compare against self-reported type, not a professionally administered MBTI. Some players may be mistyped to begin with, which would deflate our accuracy rate.
Selection bias: Most players come from Reddit and Facebook MBTI communities. Experienced type enthusiasts may produce higher accuracy than a general population sample would.
Small samples: Several types have fewer than 10 known-type data points. Per-type accuracy for these types is unstable and should not be cited as definitive.
No control condition: We have not yet tested whether players could achieve similar accuracy by simply selecting their own type from a list.
Card language: SPs are the hardest to type accurately (72% vs 97% for NFs). Dr. RoBards designed and refined the original cards over 30 years of clinical use to minimize bias across all temperaments. The digital adaptation removes the in-person context she relied on — body language, pacing, follow-up questions — which may account for some of the accuracy gap. Improving SP accuracy is our #1 priority.
Based on the work of Martine J. RoBards, Ph.D. (1946–2017). All accuracy data is available on this page. For questions: michaelarobards@gmail.com