Model A Companion Note
The Structure Behind the Seven Dichotomies
A companion note to the videoModel A: The Seven Aspect Dichotomies
Some reflections after making the video, and after discussion with members of the WSS community: what still stands, what I would frame differently, and what the hidden structure of the seven aspect dichotomies reveals.
After The Video
What The Note Adds
The video introduces the seven aspect dichotomies as a teaching sequence. This note looks at the structure behind that sequence more carefully: which dichotomies are genuinely independent, which are mutually constrained, and why that distinction matters.
The practical content of the video still stands. The correction is subtler than that. It concerns the triangular relationship among the first three dichotomies: they constrain one another rather than operating as three independent generative steps.
The Question
The Question
In the video I open with three dichotomies I call ontological: Judgment versus Perception, External versus Internal, and Detached versus Involved. My claim is that these three, taken together, are enough to derive the four information domains — Logic, Ethics, Sensing, and Intuition — before the remaining dichotomies are introduced.
That claim is pedagogically useful. But a question raised in the WSS community prompted me to look more carefully at whether those three dichotomies are doing equal and independent work — or whether something about their relationship has been misrepresented.
The answer matters. Not for the practical content of the video, which stands. But for anyone who wants to understand the deeper structure of the seven dichotomies and what it means for the aspects to be a coherent system.
The Problem
The Problem With The Ontological Three
Look at what the three ontological dichotomies actually produce when applied to all eight aspects.
| Aspect | Judgment / Perception | External / Internal | Detached / Involved |
|---|---|---|---|
| Laws | Judgment | External | Detached |
| Pragmatics | Judgment | External | Detached |
| Relations | Judgment | Internal | Involved |
| Emotions | Judgment | Internal | Involved |
| Senses | Perception | External | Involved |
| Force | Perception | External | Involved |
| Telos | Perception | Internal | Detached |
| Ideas | Perception | Internal | Detached |
There are only four distinct rows. Laws and Pragmatics are identical. Relations and Emotions are identical. Senses and Force are identical. Telos and Ideas are identical.
Three dichotomies should produce eight distinct combinations — two to the power of three. They produce four. The ontological three cannot identify all eight aspects on their own. Something is structurally wrong.
The Seven Dichotomies
The Seven Dichotomies As A System
This mutual constraint is not an isolated quirk. It is the signature of a coherent underlying structure.
Seven dichotomies, each binary, would normally produce 128 possible combinations. There are only eight aspects. The seven dichotomies are not independent of one another — they form an interlocking system where each one can be derived from combinations of the others.
The entire set of seven can be generated from just three genuinely independent dichotomies. Every other dichotomy in the set is a derived combination. This is the mathematical structure of a three-dimensional binary space: three axes, eight points, seven meaningful cuts through that space — each axis alone, each pair combined, and all three combined together.
One valid set of three independent generators is Judgment versus Perception, External versus Internal, and Introverted versus Extroverted. Another equally valid set replaces Judgment/Perception with Detached/Involved, since those two are interchangeable within the mutual triangle. The remaining four dichotomies follow from any such valid basis:
| Generator Combination | Derived Dichotomy |
|---|---|
| Within the ontological triangle | Any one of the three is the combination of the other two |
| Judgment/Perception + Introverted/Extroverted | Static / Dynamic |
| External/Internal + Introverted/Extroverted | Attractive / Repulsive |
| All three independent generators | Conclusive / Questionable |
You can verify each of these against the full assignment table. They hold throughout.
Ontological Triangle
What The Ontological Three Actually Represent
Since the three are mutually constrained rather than independently foundational, the question of what they collectively represent deserves a careful answer.
Each of the three describes the aspect's orientation toward reality from a different angle. Judgment versus Perception asks what kind of cognitive operation the aspect performs — does it apply a pre-existing framework or receive information as it comes? External versus Internal asks what field of reality the aspect attends to — the outer world or the inner one. Detached versus Involved asks what relational stance the aspect takes toward its subject — does it hold the subject at arm's length or immerse itself in it?
These are three genuinely different ways of characterising the same underlying structure. The four domains that emerge — Logic, Ethics, Sensing, Intuition — can be read through any of the three lenses, and each reading is informative. The triangle is a feature, not a defect: it means the four domains are robust enough to be described coherently from three different conceptual starting points.
What the triangle does not give is eight distinct aspects. For that, a genuinely independent fourth dimension is needed. Introverted versus Extroverted provides it, and crucially, it is independent of all three members of the ontological triangle. It does not derive from any of them or from any combination of them. This is why the video's structure works even while the mathematical relationship within the ontological three is more complex than three independent steps would suggest.
Independent Bases
Is There A Single Fundamental Set Of Three?
Not uniquely. Multiple valid sets of three independent dichotomies exist. Each of the following correctly identifies all eight aspects:
| Basis | Independent Set |
|---|---|
| Basis One | Judgment/Perception, External/Internal, and Introverted/Extroverted |
| Basis Two | Detached/Involved, External/Internal, and Introverted/Extroverted |
| Basis Three | Static/Dynamic, External/Internal, and Introverted/Extroverted |
| Basis Four | Judgment/Perception, Detached/Involved, and Introverted/Extroverted |
What all valid sets share is that they include Introverted versus Extroverted, or one of its equivalents in the system. What no valid set can include is all three members of the ontological triangle simultaneously, because those three are not independent of one another.
Video Framing
Why I Frame It As I Do In The Video
I use the three ontological dichotomies to introduce the four domains before Introverted versus Extroverted appears. That is a deliberate pedagogical choice. Arriving at Logic, Ethics, Sensing, and Intuition as named categories before splitting each into two aspects gives the viewer a conceptual scaffold. It makes the final split — the one that distinguishes Laws from Pragmatics, Senses from Force, and so on — land with more clarity than it would if introduced cold.
What the video does not address — because it falls outside the scope of a single video — is the triangular relationship within the ontological three. The video presents three steps, each adding a new distinction, when the mathematical reality is that the three steps are not independent: any two of them already contain the third. The four domains are fully determined by any pairing of the three dichotomies, and Judgment versus Perception has no privileged status as the first or most fundamental of the three. It could equally be described as falling out of External/Internal combined with Detached/Involved.
None of this breaks the video's argument. The ontological three do give the four domains. Introverted versus Extroverted does give the eight aspects. But the relationship among the first three is richer and more symmetrical than the sequential structure of the video implies, and understanding that symmetry is part of understanding why the seven dichotomies form a coherent system rather than an arbitrary list.
Terminology
Rational And Irrational: The First Dichotomy's Other Name
The same community discussion that prompted the analysis above raised a second question I have been turning over since: should the first dichotomy be called Judgment versus Perception at all, or would Rational versus Irrational have been the better choice?
Both names refer to the same dichotomy. Rational and Irrational is Augustinavičiūtė's original terminology, directly from the source. Judgment and Perception is the terminology used in WSS presentations, and since TetraTypes presents Model A using WSS conventions, that is why the video uses it. But the choice is not trivial, and on reflection I think each name carries advantages the other does not.
The triangular analysis above adds a new dimension to this question. Since Judgment versus Perception has no unique mathematical priority within the ontological three — it could be derived from the other two just as easily as either of the others could be derived from it — the choice of name matters more, not less. If Judgment/Perception cannot claim to be the primary or most foundational of the three, it needs to earn its position at the front of the sequence on conceptual rather than structural grounds. And the case that Rational/Irrational does that job better than Judgment/Perception is, I think, a strong one.
The Case For Rational And Irrational
Rational and Irrational is the terminology anyone will encounter the moment they go beyond TetraTypes and read socionics literature. Starting with Judgment and Perception means introducing a translation step that the viewer has to negotiate later. Starting with Rational and Irrational gives them the term they will actually need.
More importantly, it avoids a false cognate. Many viewers will arrive with a background in MBTI, where J and P carry specific meanings — meanings that are related to socionics but not identical, and related in ways that are easy to get slightly wrong. A viewer who thinks they already know what Judging and Perceiving mean will import that understanding quietly and may never notice where it diverges. A viewer encountering Rational and Irrational has no prior framework to mis-import. The unfamiliarity is protective.
There is also a precision argument. "Rational" in the socionics sense means governed by a pre-existing framework or standard — a rational aspect applies a criterion that exists before the information is encountered, whether that criterion is logical or relational. "Irrational" means responsive to information as it presents itself, without a prior framework filtering it. "Judging" suggests a temporal act of evaluation, which slightly misrepresents the mechanism. You are not judging in the moment. You are applying a standard that precedes the moment. Rational captures this better.
The Case For Judgment And Perception
The strongest objection to Rational and Irrational is the word Irrational itself. In plain English, irrational means unreasonable, driven by emotion rather than logic, not to be trusted. Telling a viewer that Senses, Force, Telos, and Ideas are irrational aspects sounds alarming in a way that requires immediate correction. The video already addresses similar risks elsewhere — the relationship between Judgment and Conclusive is clarified explicitly because the conflation is predictable. But that correction takes effort, and some viewers will have already formed the wrong impression before the correction arrives.
The consistency argument also has weight. TetraTypes uses WSS conventions, and WSS uses Judgment and Perception. Departing from that convention, even with good reason, creates a small asymmetry between the video and the broader WSS framework it is trying to introduce.
Where I Come Down
The irrational problem is real but addressable. A single clear definition — irrational in this context means responsive, not unreasonable — handles it, much as the video already handles the Conclusive/Questionable risk. The false-cognate problem with Judgment and Perception is harder to fix because it produces confident misunderstanding rather than uncertainty. A viewer who has never encountered MBTI hears Judgment and Perception and learns it fresh. A viewer who has encountered MBTI hears it and thinks they already know what it means. They are wrong in a specific, persistent way that a definition slide may not reach.
Given that TetraTypes is explicitly introducing socionics to an audience that will largely have come through MBTI, that risk probably tips the balance. If I were starting the video again, I would use Rational and Irrational, address the plain-English problem head-on in the definition slide, and trust the viewer to update. The WSS convention question is the one genuine pause — and it is worth noting that even within WSS contexts, Rational and Irrational appears alongside Judgment and Perception as an equivalent term rather than a rival one. Using it would not place the video outside WSS conventions; it would simply reach for the fuller vocabulary those conventions recognise.