Chapter 8: Structural Models of Personality

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Welcome back to the Deep Dive.

Today we are taking on a topic that really truly sits at the core of how we understand ourselves and each other,

personality.

That's right, and we're going deep.

We're dedicating this session entirely to understanding the architecture of personality.

The architecture.

I like that.

How psychologists have tried to bring some kind of fundamental order, some structure, to what can feel like a pretty chaotic world of human traits.

Exactly.

Our source material today is a scholarly chapter on structural models of personality, and we're going to treat it like a master blueprint.

Our mission is really to unpack this for you, step by step.

So you'll get a map of the key theories, the models, and of course, the big debates in the field.

We're looking for those aha moments, you know, the insights that manage to condense decades of really complex research into something clear and digestible.

Okay, let's start with the basics then, terminology.

In science, language is everything, and we're talking about models.

But that word, it's a bit slippery, isn't it?

It's very ambiguous.

The sources are quick to point out that when we say model here, we are not talking about a person, like a role model or a fashion model.

Right.

We're talking about a simplified schematic representation of a complex reality.

Think of it like a diagram or maybe a set of equations.

It's an economical way to communicate a concept.

A tool for thinking.

A tool for thinking, exactly.

And crucially, a good psychological model has to be testable.

You have to be able to check if it's adequate.

So it's a simplified, organized tool.

But then we have the word structural.

Why the emphasis on structural models.

Doesn't that feel a little redundant if a model is already an organization of concepts?

That is a sharp question, and the source actually acknowledges that it's a bit of a tautology.

But structural serves a really critical purpose here.

Which is?

It signals that the explicit focus is on the organized character of personality, the traits, the mechanisms, the processes.

It emphasizes that the goal isn't just to test an idea that's already there, but to actively find a certain order that's inherent in the data.

It's the search for that underlying reliable structure that makes the model structural.

Got it.

And when researchers go on that search,

the main tool they use, the standard recipe, is a mathematical technique called factor analysis.

Exactly.

Factor analysis is so fundamental to this work that the chapter almost treats it as a metonymy, you know, a shorthand for structure itself.

Okay, so for anyone who isn't a stats wizard, can you break that down?

What is it actually doing?

Think of it as a powerful distillation process.

Researchers will gather data on hundreds, maybe thousands of different traits, and then they look at how all of those traits correlate with one another.

The technique then identifies the smallest possible number of underlying hidden dimensions, we call them factors, that are needed to explain most of those correlations.

Its entire purpose is economy.

So you want the shortest possible list of columns to organize this huge data set of human difference.

That's the perfect way to put it.

You want the most economical representation possible.

And when you say most economical representation, I mean, for anyone listening today, one thing immediately comes to mind.

We land squarely on the dominant paradigm,

the Big Five model.

We do.

The Big Five has achieved this, this iconic, almost authoritative status.

It's become the standard reference point for pretty much any discussion on personality structure for the last few decades.

And I'm sensing a but here.

There's a big but.

As we're going to see, treating it as the final word gives it an empirical reach that might be a little exaggerated.

To really understand its power and its limitations, we have to trace its history.

We have to see that it's only one somewhat restricted view of the full personality domain.

Okay, that sets the stage perfectly.

Let's dive right into that history.

Section one, the historical roots of modern structural models.

And this whole story starts with a problem just too much information.

It's a problem of sheer chaos.

You have to go back to the 1930s.

Alport and Odbert went through the dictionary and cataloged thousands and thousands of trait descriptive adjectives in English.

An enormous sprawling list.

Completely unmanageable from a scientific perspective.

And R .B.

Cattell, writing a bit later in 1965,

he famously complained about this.

He said the core difficulty with measuring traits was that there were just too many of them.

So Cattell steps in.

He becomes the pioneer who's determined to tame this, what he called the trait alphabet.

His whole approach was based on the lexical hypothesis.

Yes, the idea that the most important individual differences, the things that really matter in how we differ, are all encoded and preserved in our natural language.

And his effort to do this was, I mean, it sounds heroic for the time.

It really was.

He started condensing this massive vocabulary and he managed to reduce the entire

personality sphere, as he called it, down to 171 trait descriptive items, which is a huge achievement in itself.

But then the reality of mid -20s sum -free science kicks in.

Exactly.

The computational limits.

They just couldn't perform the massive factor analysis that we can do today with a click of a button.

So that forced him to shrink the data set even more.

He cut it all the way down to just 35 trait variables.

35.

And he believed those 35 summarized the entire domain.

He later called that reduction a matter of unhappy necessity.

It was forced on him by the primitive tools of the pre -computer era.

But what is truly astonishing, and this is the key point, is that this single computationally limited set of 35 items became the origin point for three major, distinct, and often competing models that still dominate the field.

It's like the historical nexus of personality research.

From one set of correlations, you get three different paths branching out.

Precisely.

Okay, let's take the first path.

Cattell's own creation, the famous 16 -factor model or the 16 -PF.

So Cattell takes his 35 variables and he factor analyzes them.

He extracts 12 primary factors.

But the key technical choice he makes is using what's called oblique rotation.

Okay, you're gonna have to explain that one.

So factor analysis involves rotating the axes of the factors in this kind of mathematical space to make the results clearer.

You have two main ways to do it.

Orthogonal and oblique.

Right.

Orthogonal rotation forces your factors to be independent, uncorrelated, which tends to make the factors you get much broader.

Oblique rotation, which is what Cattell used, allows the factors to correlate with each other.

So he let his primary factors talk to each other, so to speak.

He didn't force them into these neat separate boxes.

Exactly.

He was aiming for what he called a simple structure.

And this process, finding that simple structure through oblique rotation, was this painstaking trial and error procedure.

The sources note it took him six months to do it without modern computers.

Wow.

And those 12 primary factors plus four more that were specific to the questionnaire itself, they became the basis of his 16 -PF.

But here's the twist.

Almost immediately you have other researchers looking at the exact same starting data.

And they come to a dramatically different conclusion.

And that brings us to the second branch, the emergence of the Big Five.

This is one of the best demonstrations of how much ambiguity there is in psychometric choices.

Starting with Fisk in 1949, and then confirmed again and again by Toups and Crystal and Norman, they analyzed the exact same correlation matrices from Cattell's 35 variables.

But instead of seeing 12 factors, they consistently found that only five factors were needed to best summarize that data and to replicate across different samples.

And that five -factor structure eventually gets a catchy name.

It does.

Goldberg popularized it in 1981, and he's the one who coined the term the Big Five.

So stop right there.

What does this tell us?

The same 35 variables lead to a 12 -factor structure for Cattell and a five -factor structure for everyone else.

It can't just be about the data itself, can it?

It tells you that the adequate number of factors is fundamentally a psychometric choice.

It's not a fact of nature.

It depends heavily on the level of abstraction you're looking for and the specific rotation technique you use.

So it's about the lens you use to look at the map.

Perfectly put.

Cattell prioritized granularity, a very detailed map, which gave him 12 or 16 primary factors.

The Big Five researchers prioritized the broadest, most replicable dimensions.

They were essentially extracting the secondary factors that were hiding underneath Cattell's primaries.

It's all about the magnification level you choose.

That is a crucial distinction.

Okay, so that's two branches.

The third offshoot, the NEO three -factor model, also came from Cattell's work, but it took a different path to get there.

Right.

Costa and McCray didn't go back and refactor the original 35 items.

Instead, they took the final product, the 16 -PF scales, and they performed cluster analysis on them.

What were they looking for?

They were looking for stable, reliable clusters of those 16 factors across different age groups.

And they consistently found two big ones that were independent of age, one for adjustment anxiety, which we now know is neuroticism, and one for introversion, extroversion.

Big two again.

And the third factor.

Initially, they had trouble finding a third consistent cluster, but they conceptualized it as an experiential style dimension, which later became openness to experience.

And these three clusters, which were essentially just secondary factors of the 16 -PF, became the foundation for the three -factorial NEO personality inventory.

So it's amazing.

The three dominant structural approaches, 16 -PF, Big Five, and EO, they all spring directly from that one data set that Cattell so painstakingly put together.

It's the big bang moment for modern personality structure.

That historical tracing is so important.

We've got the origin story.

Now let's move into section two and look at the classical structures themselves, focusing on the three giants, Cattell, Guilford, and iSync.

And Cattell is the best place to start if you want to understand the concept of hierarchy.

He didn't just see 16 separate factors.

He saw personality as this nested system, organized vertically.

Okay, so let's map out his hierarchy.

What's at the bottom?

At the absolute bottom, you have what he called trait elements.

These are just single trait words.

Polite, impulsive, things like that.

Simple enough.

These then combine into surface traits.

These are the trait clusters or syndromes that you can just empirically observe.

Traits that tend to go together in everyday life.

And above those.

Above those are the source traits.

These are the actual underlying statistical factors that he derived from his analysis.

These are his 16 -PF primary factors.

And because he used that oblique rotation, allowing them to correlate.

Exactly.

He could then take the correlations between his source traits and factor those correlations, searching for an even broader level of abstraction.

Which led him to higher order factors.

Precisely.

He called them secondary factors.

And Cattell himself later reported that he found eight stable secondary factors over two decades of research.

This vertical nested structure is absolutely crucial to his whole view.

But this is where the conflict with the five factor model comes roaring back.

Even from within Cattell's own system.

It does.

Because when later researchers went back and rigorously analyzed Cattell's own 16 -PF data, they often found less support for his eight secondary factors.

For instance, an analysis by Hoffer and Aber in 2002 provided really strong evidence that the 16 -PF did itself was best summarized by a five factor structure at that secondary level.

That's incredible.

The five factor structure wasn't just a critique of Cattell.

It was an inevitable finding within his own system.

Just one level higher up the hierarchy than he was focused on.

That's it.

And those five factors included things like extroversion, tough -mindedness, self -control, anxiety, and independence.

It just shows the enduring stability of that five factor solution once you reach a certain level of abstraction.

Now let's turn to the second classical structure.

Guilford's factors.

The sources suggest his approach was more of a gradual build rather than some grand structural plan from day one.

That's a good way to put it.

Guilford and his team started with smaller questionnaire studies focused on specific behaviors.

Initially, they isolated three clear factors.

Introversion, extroversion, emotional sensitivity, and masculinity, femininity.

And then they just kept adding more.

Through subsequent targeted factor analyses.

Yeah, they kept adding factors until they eventually isolated up to 13 primary factors.

So that puts Guilford's count somewhere between the big five and Cattell's 16 PF.

And when you compare Guilford to Cattell, where is the common ground?

What did they agree on?

Well, a major comparative study found that despite all the differences in their systems, there were really only two factors that showed major commonality.

Emotional stability and social extroversion.

There they are again.

Always.

But they also found clear links between Guilford's factors and the emerging big five structure, especially in the areas that would become conscientiousness and agreeableness.

That universal recovery of emotional stability and extroversion is a perfect segue to our third classical model.

Ising's three -factor model, or PEN.

And what sets Ising apart is that his whole conception was explicitly theoretical from the start.

Absolutely.

Ising was guided by historical theory.

He was drawing heavily from people like Jung with his ideas on introversion, extroversion, and Kreshmer's work on temperament.

He wanted to create a theory -driven structure first and then use psychometrics to confirm it.

And he proposed a four -level organization of behavior.

Right, which aligned perfectly with the statistical model of factor analysis.

At the bottom, you have single observable acts.

Those group into habitual responses.

Intercorrelations of those responses form traits.

And at the very top?

At the top, you have what he called types of traits.

These are his famous super factors.

Psychoticism, P, extroversion E, and neuroticism, N.

The PEN model.

And if Cattell started with this huge list of words from the dictionary, what was Ising's starting data pool?

It was completely different.

Ising used a relatively small set of just 39 items and they were selected from clinical item sheets the record psychiatrists used to rate patients.

So it was a clinically -derived, not lexically -derived.

Exactly.

It was a hybrid list covering things like social history, symptoms, and personality.

A very targeted starting point.

And based on ratings from that list, he first confirmed neuroticism, then introversion, extroversion, and then later integrated the more complex concept of psychoticism to complete the PEN system.

Okay, let's pause and synthesize this.

We have these two titans, Cattell and Ising, with two very different philosophies about structure.

The differences are profound and they really define the debate for decades.

First, you have their approach to hierarchy.

Both agreed on a nested structure.

They did.

But Cattell was guided by the psychometric ideal of simple structure.

Ising was guided by prior psychological theory and just used factor analysis to confirm his theoretical levels.

And the second point, which I know causes endless confusion, is their terminology.

This is so critical.

Cattell used the word types to refer to his broad primary factors, the surface traits at a lower level.

Ising, on the other hand, used the word type exclusively for his highest order superfactors, P, E, and N.

So if you mix up those definitions, the whole debate about whether 5 or 16 is the right number just becomes nonsense.

Total nonsense.

They're talking about different levels of the hierarchy.

And of course, their item sets were totally different.

One lexical, one clinical, one aimed for statistical elegance, the other for theoretical coherence.

Yet despite all this variance,

there was one major point of consensus.

And that brings us to section 3.

Synthesizing the pioneers.

What did everyone agree on?

They all agreed on the big two.

Wiggins, looking back over this whole landscape in 1968, he famously concluded that if there was any consensus at all on temperament structure, it's centered on extraversion and anxiety or neuroticism.

The big two.

He dubbed them the big two.

Their status was later called beyond dispute.

They are the absolute bedrock of personality structure.

The stability of E and N provides the foundation, but then the field just explodes when the big five structure starts getting firm confirmations, which ushers in this new era of cyclical studies.

The dominance of the big five really comes from these huge, comprehensive taxonomic studies.

These were programs in multiple Germanic languages, Dutch, English, German, that aimed to just thoroughly catalog every personality adjective in that language.

And they kept finding the same thing.

Again and again, these indigenous efforts yielded the five factor structure, and that's what cemented its iconic status as this seemingly universal structure of personality.

But iconic status always invites criticism, and the critiques came directly from the pioneers themselves.

Starting with Cattell.

Oh, even in the 1990s, Cattell was heavily criticizing the big five.

He argued that five was simply the wrong number of secondary factors.

He maintained that his 16 -PF system consistently produced eight secondary orders, and that the big five was just an oversimplification.

Isaac also challenged it, but from a different angle.

He argued that some of the big five factors weren't abstract enough to be super factors.

Right.

Isaac proposed that agreeableness and conscientiousness weren't these big second order factors in their own right.

He saw them as lower level primary factors that were just partial aspects of his highest order factor, psychoticism.

So being high on agreeableness is just one way of being low on psychoticism.

That was his argument.

And it's a crucial intellectual debate.

It forces you to really question the level of abstraction that each of these factors is operating at.

The big five claimed universality, but the real acid test for a claim like that is the cross -cultural test.

If this structure is truly fundamental, it has to replicate across different languages and cultures.

And this test, well, it revealed a major crack in that universality claim.

Studies comparing these psychologically -derived five -factor structures across languages, Dorad and others did some really robust work here.

They used rigorous tools like congruence coefficients to measure the similarity.

And the finding was?

The finding was striking.

Only the first three factors of the big five are consistently and highly replicable across cultures.

Extraversion, agreeableness, and conscientiousness, EAC.

Wait, so the big five is universal, except only three of the five factors are actually universal.

That's the complex conclusion from these adjective -based studies, yeah.

Emotional stability showed moderate replicability, but intellect or openness was found to be the least coherent factor cross -culturally when you only look at trait adjectives.

So that's just a three -factor solution might be the most stable lexical kernel.

It did, and it forced researchers to ask a tough question.

Why do we sometimes find the big five, but only find three factors reliably across all languages?

Which leads us directly to the next phase of research.

Exhausting the domain.

People started to wonder if the problem wasn't the number of factors they were extracting, but the restrictive list of words they started with.

Precisely.

If the big five isn't fully robust, there are two possibilities.

Either the math isn't quite right, or the lexical approach itself was too narrow.

Maybe they excluded critical types of words like evaluative terms, good, bad, or state terms, which are temporary feelings.

And that idea paved the way for models that went beyond five factors.

They opened the door completely.

So let's explore those.

We start with the big six, which introduced a new factor,

honesty, humility.

Astonently argued that when you really focus on optimally exhausting the factor structure, a sixth factor consistently pox out.

Honesty,

humility.

This captures traits like sincere, fair, and honest, versus things like boastful, deceitful, and dishonest.

And this was found in a lot of languages.

It was, but not consistently across all studies.

It remained particularly elusive in American English lexical studies, which is interesting.

Next up, the big seven.

This model directly tackled that issue of excluding evaluative and state terms.

Right.

Almagore, Tellegen, and Waller used what they called a non -restrictive approach in Hebrew.

They included those evaluative terms, and they found versions of the big five, plus two entirely new factors that were all about judgment.

Which were?

Negative valence, describing people with words like envious, mediocre, or a fabricator, and positive valence, using words like sophisticated, sharp, or talented.

This was a huge confirmation that if you include the words we use to judge people, you need more than five dimensions.

And finally, the ultimate effort, the big eight.

This went beyond just adjectives to include, well, everything.

Dorad and Barrels conducted a truly exhaustive study in Dutch.

They compiled a massive list of over 2 ,000 descriptors, nouns, verbs, adverbs, everything.

And when they factor analyzed this massive collection, they found the big five plus three new factors.

What were the three new ones?

Virtue, which is things like trustworthy and polite, competence has vision, solves problems, and hedonism, sensation seeking, impulsive.

This big eight structure is probably the most complete empirical map of the trait domain from a single language so far.

This is where it gets really fascinating for me.

Because while some researchers were finding more and more factors, six, seven, eight others, we're simultaneously looking for fewer factors at the very top of the hierarchy.

Which brings us to section five.

Beyond the five, the basic structures and the apex.

This is the pursuit of the absolute highest level of abstraction.

Digman in 1997 did something brilliant.

He analyzed 14 different sets of big five factor correlations, he asked.

Do the big five dimensions themselves correlate with each other?

And if they do, how do they cluster?

And if you have only two higher order factors?

Exactly.

He consistently found that the big five collapsed into two broad dimensions, which he called alpha and beta.

Okay, break those down for us.

Alpha typically captured agreeableness, conscientiousness, and emotional stability.

And beta typically captured extroversion and intellect or openness.

So if you zoom out far enough, the big five becomes the basic two.

And this connects directly to something really fundamental by human motivation, doesn't it?

It connects directly to Back and Con's powerful meta -concepts of agency and communion.

Getting ahead, getting along.

That's the simplest way to put it.

Agency is the drive for personal fulfillment, mastery, getting ahead.

That aligns with beta extroversion, intellect.

And communion is about relationships, belonging, getting along.

And that aligns with alpha agreeableness, conscientiousness, stability.

That's a phenomenal synthesis.

And the strength of this basic two structure is that it wasn't just found by factoring questionnaires.

It also emerged directly from those big psychalexical projects we were just talking about.

That's what confirms its fundamental status.

When Saucer structured the Greek trait language using only two factors, he got morality and dynamism.

De Raad and Beralds found virtue and dynamism in Dutch.

These two incredibly broad factors, one about character and relationships, the other about energy and mastery.

They seem to be the generalizable kernels of personality.

So what's the unifying theme of those basic two factors?

What's fascinating is what they correlate with.

In that Dutch study, virtue and dynamism correlated incredibly highly.

We're talking 0 .90 and 0 .85 with a general index of evaluation.

So they're the dimensions we use to judge people.

They're the primary dimensions by which we assess others.

So if they both correlate so highly with a single overall evaluative dimension,

what happens if you take that final step?

If you factor for the one single most dominant dimension at the absolute peak of the hierarchy?

You arrive at the concept of the P factor, the single basic factor, the grand apex of the entire personality structure.

Hostey named it the P factor in 2001, and he drew a direct parallel to the general intelligence factor.

And its existence comes from something called the positive manifold.

Can you break that down in this context?

Sure.

Imagine you list all the traits we tend to value.

Honest, reliable, sociable, responsible, hardworking.

A positive manifold just means that people who score high on one of those positive traits tend to score high on all the others.

They all correlate positively.

So the P factor is what they all have in common.

It's the statistical dimension that captures all that shared positive variance.

Essentially represents the most valued psychological characteristics in person.

Morality, virtue, just overall desirable character.

This isn't some brand new idea.

This connects way back to the very foundations of character studies.

Absolutely.

The P factor is the modern answer to a century -old question posed by Webb back in 1915.

He was actively looking for a general factor of character that existed alongside the general intelligence factor, G.

And he defined it as the sum of all personal qualities which are not distinctly intellectual.

So we've established this incredible vertical architecture.

The P factor at the very top.

The basic two of agency and communion below that.

And then the big five, six, or eight at the primary level.

Now let's shift to section six and explore the shape of that structure.

Hierarchy and circular models.

The consensus is firm.

Personality is organized hierarchically.

But we have to distinguish between the neat theoretical ideal of a hierarchy and the messier psychometric reality.

And the theoretical ideal is best represented by Eysenck's model.

Correct.

Eysenck hypothesized a very strict four -level hierarchy.

The key principle is inclusion.

A category at a lower level, say the specific act of always being on time, is included in one and only one higher level category like the trait conscientiousness.

So there are no overlaps.

Conscientiousness and extraversion are like two separate pipes leading up to the next level.

Exactly.

No links between categories at the same level.

But when we look at the actual data from factor analysis, especially with the big five, we run into the issue of trait fuzziness.

What do you mean by fuzziness?

Well, the reality of psychometric results is that even though we aim for a simple structure where every variable loads highly on one factor and zero on all the others, that's not what we get.

In the empirically derived big five structure, most trait variables show a pretty substantial degree of fuzziness.

Give us an example.

A trait variable like warm might have its primary loading on extraversion, but it'll often have a substantial secondary loading on another factor like agreeableness.

It's like trying to sort a library into five perfect, distinct genres.

Most books fit neatly, but a lot of them are mystery romances or sci -fi histories.

They have a primary home and a secondary one.

That makes perfect sense for describing real people.

Traits aren't members of one and only one category.

They belong to several.

That's the fuzziness.

And researchers like Hampson, John, and Goldberg tested this empirically.

They used a principle called concept asymmetry.

They'd ask people, which makes more sense?

To be X is a way of being Y or to be Y is a way of being X.

So to be talkative is a way of being social.

Makes more sense than the other way around.

Precisely.

Which tells you that social is the broader, higher level concept.

And using that method, they could empirically map out these nested hierarchies, validating the whole structure.

OK, so that's the vertical organization.

Now let's shift to the horizontal structure, which is what really addresses that fuzziness.

This is the domain of circular structures or circumplex models.

The circumplex is the perfect visual representation for that fuzziness.

It arises when a large number of treat variables, the source says around 30 % in one model load substantially on two factors at the same time.

So instead of forcing them into one box.

You embrace the blend.

The circumplex takes the loadings on that pair of factors, say our basic two, virtue and dynamism, and it uses them as coordinates to plot the traits on a two -dimensional plane, like a circle.

So every point on that circle represents a unique blend of the two underlying dimensions.

Exactly.

And that's the key advantage.

It clarifies the relative positions and the blended meanings.

Traits on the circle are close in meaning to their neighbors, and their psychological opposites are found exactly 180 degrees apart.

And these models are often divided up into segments, like a pie chart.

Right, the question of segmentation.

The interpersonal circumplex tradition typically uses eight segments, or octants, because those correspond to theoretically defined interpersonal styles.

But other models, like the abridged big five circumplex, use 12 segments for a finer grain distinction.

The decision is just about maximizing theoretical relevance and descriptive detail.

This whole exploration of structure from the vertical P factor down to these horizontal blends, it all brings us to our final section, future directions.

And the source uses a great framework for this from Lave in March, evaluating models based on truth, beauty, and justice.

It's an excellent lens for figuring out where the field needs to go next.

We have to hold our models accountable to these criteria.

So let's start with criterion one.

Truth.

This is all about adequate representation and testability.

The historical debate has been filled with strong opinions.

Kittel versus the big five, for example.

And the source warns that the big five's consensus might have come partly from a kind of circular reasoning.

Researchers were pursuing the big five structure because it was the one they expected to find.

So to achieve greater truth, we need more rigor.

Much more psychometric rigor.

It means making greater use of specific statistical markers, like calculating congruence coefficients to quantify how similar factor structures are across different data sets.

We need to prove that the structure isn't just an artifact of one particular study.

Okay, next is criterion two, beauty.

This is about simplicity and elegance.

The attractiveness of a model lies in its economy, getting the most explanatory power from the fewest factors.

That's why the big five became so much more attractive than the 16 -PF.

But beauty is also about the elegance of the structure itself.

So it's not just about counting factors.

No.

Future models have to explicitly focus on developing both the vertical hierarchy and the horizontal certainplex differentiations at the same time.

A beautiful model maps the structure in three dimensions, not just as a flat list.

Any candidate beyond the big five has to be tested against these dual structural requirements.

And finally, criterion three,

justice.

How does justice apply to a personality model?

Justice means developing assessment instruments that are adequate for tackling real scientific and societal problems.

For the last two decades, assessment has been overwhelmingly focused on the big five.

But future instruments need to be more sophisticated.

They have to be.

They need to benefit from establishing the major dimensions, but also respect the necessary distinctions we've been talking about.

Meaning they need to capture the granularity.

Yes.

They need to respect the difference between primary and secondary factors, and they need to incorporate the horizontal blends from the circumplex.

If we only test the big five, we might be missing crucial factors like honesty humility, or these nuanced blends that could have immense predictive power in the real world.

So what's the ultimate goal for structural research using these three criteria?

The final goal is to achieve an international cross -cultural consensus on the most fundamental kernel structure of personality, defining it precisely both vertically and horizontally.

And the most promising path seems to be focusing on assessing that highest level,

the single P factor or the basic two dimensions of agency and communion derived from these huge cross -linguistic projects.

We've traced personality structure from Cattell's initial reduction down to 35 traits through these fierce battles over factor numbers and all the way up to that single fundamental P factor of character.

It's an incredibly complex and elegant field, and it's amazing to realize that the basic question, how do we organize the words we use to describe each other, is still what drives the research today.

Indeed.

These structural models are indispensable tools for bringing economy and communication to a field that can be chaotic.

And while the big five is still iconic, the cutting edge of research is really focused on refining the structure at its highest level, the basic two, agency and communion, and at its most detailed levels, using the circumplex to capture those critical trait blends.

The structure of personality is so much more dynamic than a simple five -factor checklist.

Thank you for joining us on this deep dive into the structural models of personality.

A warm thank you for joining this deep dive from the Last Minute Lecture team.