Research
Where this model came from, what the research does and does not support, who publishes the site, and the line between useful insight and advice we cannot stand behind.
Last reviewed September 6, 2026 · Shailendra Zade, Founder & Developer
The introversion and extraversion pair, and the thinking and feeling pair, entered psychology with Carl Jung, who in 1921 described them as habitual orientations of attention and contrasting ways of reaching a judgment. Jung wrote about tendencies he observed in clinical work. He did not publish a questionnaire, and he did not propose sorting people into sixteen boxes.
The questionnaire form came later, when the four pairs were turned into a self-report instrument and the results were reported as a four-letter code. That reporting convention is what most people now recognize as a 16-type test, and it is the convention this site follows. A 16-type result is useful vocabulary. It is not a measurement with the standing of a clinical test, and the published record is fairly clear about where the line falls.
Our assessment is our own. We wrote the 60 statements, we chose the scale, and we published the arithmetic. It is not the official MBTI® assessment, which is published by The Myers-Briggs Company, and it has not been through the published validation studies a commercial instrument carries. Saying so plainly is part of the standard.
A 16-type result is useful vocabulary. It is not a measurement with the standing of a clinical test, and the published record is fairly clear about where the line falls.
Reasonably supported
In the official-instrument literature, four similar scales correlate with four of the five-factor model
Preference language gives people usable words for how they work, decide, and recover
A balanced item bank and a published formula let a reader check the work instead of trusting a brand
The five-point agreement format follows the measurement technique Likert published in 1932
Not supported
That people come in sixteen separate kinds rather than spreading along four continuous scales
That a four-letter code predicts job performance, compatibility, or mental health
That a near-tie on a scale is stable enough to report as a settled letter
That this site has run its own published validation study, because it has not
Four design choices carry most of the weight, and each one exists because of a known problem with self-report questionnaires.
The answer options follow the agreement format Rensis Likert set out in 1932. The five choices map to fixed numbers: −3, −2, 0, +2, and +3. The scale is symmetric around Neutral, so agreeing strongly is worth exactly as much as disagreeing strongly. The scale skips ±1: the mild options are worth 2 points rather than 1.
People answer reversed and negated statements less consistently than plain ones, so a bank that leans one direction rewards agreeable answering rather than measuring a preference. Each of our four pairs is split evenly, which is why agreeing with everything produces a flat result instead of a flattering one.
At 55% or below, we mark the letter as too close to call, say so on your results, and name the neighboring type rather than presenting a coin flip as a finding.
In 1949 Bertram Forer handed a class one identical, vague personality sketch. It is the original demonstration that people accept a vague description as a precise portrait of themselves. Any personality report can trigger that reaction, including ours, which is a reason to treat resonance as a starting point rather than confirmation.
Each source below was checked against the publisher record before it went on this page. Links open on the publisher or archive site.
Jung, C. G. (1921). Psychological Types. English translation by H. G. Baynes, Kegan Paul, Trench, Trubner, London, 1926 printing.
Where the introversion and extraversion pair, and the thinking and feeling pair, entered psychology.
View the source (opens in a new tab)Likert, R. (1932). A technique for the measurement of attitudes. Archives of Psychology, 140.
The agreement scale our five answer options follow.
View the source (opens in a new tab)Forer, B. R. (1949). The fallacy of personal validation: a classroom demonstration of gullibility. The Journal of Abnormal and Social Psychology, 44(1), 118 to 123.
The original demonstration that people accept a vague description as a precise portrait of themselves.
View the source (opens in a new tab)McCrae, R. R. and 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 to 40.
Found that the official instrument's four scales correlate with four of the five factors, while the sorting of people into discrete types was not supported.
View the source (opens in a new tab)Capraro, R. M. and Capraro, M. M. (2002). Myers-Briggs Type Indicator score reliability across studies: a meta-analytic reliability generalization study. Educational and Psychological Measurement, 62(4), 590 to 602.
Pooled Myers-Briggs Type Indicator reliability across many samples, and showed the figure moves with the sample rather than holding fixed.
View the source (opens in a new tab)Pittenger, D. J. (2005). Cautionary comments regarding the Myers-Briggs Type Indicator. Consulting Psychology Journal: Practice and Research, 57(3), 210 to 221.
Reviews the evidence for discrete types and reports that score distributions are continuous rather than split into two humps.
View the source (opens in a new tab)Weijters, B. and Baumgartner, H. (2012). Misresponse to reversed and negated items in surveys: a review. Journal of Marketing Research, 49(5), 737 to 747.
Reviews what goes wrong when respondents meet reverse-worded items, which is why balance matters.
View the source (opens in a new tab)The Myers-Briggs Company (2026). Publisher of the official MBTI assessment. themyersbriggs.com, publisher website.
The organization that owns the MBTI trademark and publishes the official instrument. We are not affiliated with it.
View the source (opens in a new tab)Readers should know who made the test, how a letter is chosen, and what a report is allowed to say. Here is how DecodePersonality handles that.
First-hand use
Type pages here describe how a pattern shows up in meetings, conflict, and recovery, because those are the situations people actually bring to a personality test. The writing starts from the question a reader arrived with rather than from a textbook summary. Your report then opens on traits, work, growth, and relationships, so the letters connect to how you show up day to day, and the same practical chapters run across every type.
Method on the record
The assessment uses 60 items across four preference pairs, and every item counts the same. No statement is quietly weighted more than another. Our expertise is in publishing and explaining this model clearly, not in licensed clinical practice, which we do not pretend to offer. So instead of asking you to trust a credential, we published the arithmetic and every statement in the bank.
Named owners
Shailendra Zade publishes the site, and CyberRudra Technologies operates it. This page, the Privacy Policy, and the Terms are linked from the footer. We do not hide behind an anonymous “team of experts.” Shailendra Zade signs off on new type hubs and this Trust page. The review date on this page is the public stamp.
What we will not do
The free test does not require an account. Results save in this browser on this device. We do not sell personal information. We state what the test cannot do: diagnose, treat, or decide hiring, custody, or medical care. We never frame a type as a disorder, trauma diagnosis, or substitute for licensed care.
Given what the evidence above does and does not support, the honest response is to stay careful rather than to sound certain. People still reach for type language when they weigh a job, a partner, or their own worth, so these are the lines we hold.
Readers may lean on a type when they switch roles or negotiate. We describe work habits and fit in general terms. We do not rank salaries, promise promotions, or tell someone to quit.
Compatibility notes are patterns, not destiny. We do not advise leaving a partner, parenting a specific way as a medical rule, or treating a type as a character defect.
Results can stir relief or distress. We never frame a type as a disorder, trauma diagnosis, or substitute for licensed care. If you are in crisis, contact local emergency services or a qualified professional, not this site.
We never claim
A medical, psychiatric, or neurodevelopmental diagnosis
Therapy, counseling, or treatment plans
A legally binding hiring, firing, or custody recommendation
Investment, credit, or insurance advice
Affiliation with The Myers-Briggs Company or the MBTI® trademark
What we do instead
Describe preference patterns in everyday language
Show strengths, strain, and growth ideas as possibilities
Link to About, Privacy, Terms, and Contact from the footer
Invite corrections when a page is factually wrong
Keep the scoring formula and every test statement public, not summarized
This page covers the evidence and the standards. The mechanics live on their own two pages, in full, with nothing held back.
Every statement in the bank, grouped by the pair it belongs to, with its keying shown.
See the bankThe formula, a worked example, the close-call rule, and the limitations in detail.
Read the methodA type page or landing page does not go live on a slogan. This is the writing and review path.
A draft starts from the four-letter recipe, then work, relationship, and strain sections get written in concrete scenes, not slogans.
A second read strips diagnosis language, hiring rules, and medical promises. Anything that could be read as treatment is rewritten or cut.
Shailendra Zade signs off on new type hubs and this Trust page. The review date on this page is the public stamp.
Email support@decodepersonality.com with the URL and the sentence. Factual errors are patched; opinion about a type is debated, not silently swapped.
A short record of who runs the site, what the test is, and where to ask for a correction.
Who runs the site
September 6, 2026
What the test is
Free 60-item 16-type preference snapshot for self-understanding
Not a diagnosis, therapy, or official MBTI® instrument
Not required for the free assessment
Where to ask for a correction
We are not emergency care. Use local emergency services or a licensed professional.
Short answers on whether this is a clinic, how we relate to MBTI, and how to request a correction.
No. Shailendra Zade publishes the site and is not a licensed clinician, and neither is anyone else who works on it. Nothing here is therapy, counseling, or a substitute for professional care. That is also why the scoring method and every test statement are published: you can check the work instead of taking a credential on faith.
No. The report is a preference snapshot for self-understanding. We do not diagnose, treat, or tell an employer who to hire or fire. We describe work habits and fit in general terms. We do not rank salaries, promise promotions, or tell someone to quit. For health or legal questions, talk to a qualified professional.
No. We use a popular 16-type preference frame inspired by Jungian dichotomies. We are not affiliated with The Myers-Briggs Company. MBTI is a registered trademark of that organization.
Whenever the assessment, privacy rules, or named owners change, and at least when we ship a major content wave. The last-reviewed date is at the top of this page. The review date on this page is the public stamp.
Use Contact Us, choose Privacy request or General inquiry, and include the URL. We aim to reply within 1 to 2 business days. Factual errors are patched; opinion about a type is debated, not silently swapped.
Your result lives on one device, in one browser. The free test does not require an account. We do not sell personal information.
If you came here for the evidence, these pages are the next useful stop.
Every statement in the bank, grouped by the pair it belongs to, with its keying shown.
See the bankThe formula, a worked example, the close-call rule, and the limitations in detail.
Read the methodWhy we built the platform and how we think about useful personality insight.
Read about us