"So, what are you? INTJ? Red? Promoter?"
If you have ever attended a corporate training session, you have probably heard this kind of remark at the coffee break.
And that is precisely where personality models go off the rails: when they become labels stuck on colleagues' foreheads.
We work with various models used in organizations: MBTI, DISC, PCM (Process Communication Model)...
And we are regularly asked which one is "the best".
Our honest answer: none of them.
They are different lenses placed on the same human reality, and each one shows something the others cannot see.
And because we are asked the question more and more often, we are adding a more academic perspective: the Big Five, the benchmark model of psychological research.
In this article, we invite you to understand what each model really sheds light on, in which contexts it is most relevant, and above all how to use them without ever reducing a person to four letters, a colour or a floor of a building.
First of all: a model is a map, not the territory
Let's set the framework right away, because everything else follows from it.
None of these models "measures" your personality the way a thermometer measures temperature.
Each one offers a framework for interpretation: a way of structuring the observation of behaviours, preferences and needs. That is immensely useful for understanding yourself and for dialogue. It becomes dangerous as soon as it is used to fix, predict or judge.
Three safeguards we apply in all our coaching:
- The model describes dynamics, not identities.
Saying "I have a preference for introversion" opens up reflection; saying "I am an introvert, so I can't lead a meeting" shuts it down. - The person remains the expert on themselves.
The questionnaire offers a hypothesis; it is the debrief conversation that validates it, nuances it or invalidates it. - Never used against anyone.
None of these tools is designed to screen out a candidate, justify a conflict or excuse a behaviour ("that's just how he is, it's his profile").
With these precautions in place, let's get to the heart of it: what does each model do best?
MBTI: understanding your deep preferences
What it sheds light on
Stemming from the work of Carl Jung and popularised by Katharine Briggs and Isabel Myers, the MBTI explores four dimensions of preference: where you draw your energy from (Extraversion/Introversion), how you take in information (Sensing/Intuition), how you make decisions (Thinking/Feeling) and how you organise your relationship with the world (Judging/Perceiving). The result: 16 types, describing a preferred way of functioning.
Its great strength: introspection
The MBTI is perhaps the most powerful model for in-depth self-work. It helps put words to long-standing inner tensions: why meetings drain me while they recharge my colleague, why I decide "with my head" and then feel guilty, why the unexpected stimulates or paralyses me. In individual coaching, particularly during career transitions or mid-career questioning, it is a wonderful trigger for self-awareness.
Its limits
The MBTI describes preferences, not observable behaviours: it tells you little about how to actually talk to an ENFP on a Monday morning. It is also the most vulnerable to the labelling effect: the four letters quickly become an identity badge, sometimes worn with pride, sometimes endured. And it says almost nothing about stress.
When we offer it:
- Individual coaching for career direction or personal development
- Career reviews
- Long-term work on self-knowledge.
DISC: reading visible behaviour, fast
What it sheds light on
Based on the work of William Marston, DISC observes behaviour along two axes (task/people orientation, direct/reflective pace) and derives four styles from them, often associated with colours: Dominance (red), Influence (yellow), Steadiness (green), Conscientiousness (blue).
Its great strength: operational simplicity
DISC can be learned in half a day and remembered for life. It is the ideal model for quickly giving a team a common language, especially in relationship-based professions: sales, customer service, negotiation. A salesperson trained in DISC adjusts their pitch in seconds when facing a hurried, directive buyer or a cautious counterpart who wants guarantees. To create an initial collective awareness ("we don't all work the same way"), nothing is faster.
Its limits
Its strength is also its weakness: four styles make for a wide mesh. DISC describes observable surface behaviour, not deep motivations or inner mechanisms. And the colours very quickly turn into schoolyard labels ("watch out, he's a red"). Used alone, it can give the illusion of having understood someone when all you have observed is their style of the moment.
When we offer it:
- Sales and customer relations training
- Short team seminars
- A first introduction to the diversity of styles within an organization.
PCM: communicating effectively, especially under stress
What it sheds light on
Developed by psychologist Taibi Kahler from the 1970s onwards and used notably by NASA in selecting and assembling its crews, the Process Communication Model describes six personality types present in each of us, stacked in a unique order: this is the famous condominium metaphor. Each type has its own perception of the world, its preferred communication channel, psychological needs and a predictable distress sequence.
Its great strength: process, not just content
Where MBTI and DISC describe who you are or how you act, PCM focuses first on how to say things in order to be heard. It is a model of real-time interaction. Three assets clearly set it apart:
- A dynamic reading of personality.
With the distinction between the Base (set in childhood) and the Phase (which can evolve over a lifetime), PCM escapes by design the trap of the single box: you are not one type, you are a unique combination of all six, some floors of which are more accessible than others. It is the most naturally "anti-label" model, provided it is taught that way. - The best framework for reading stress.
PCM describes with remarkable precision the distress sequences of each type: the drivers, the masks, the predictable behaviours when psychological needs are not met. In practice, this changes everything: you no longer suffer a colleague's difficult behaviour, you recognise it as a distress signal, and you know what to do to defuse it. - Psychological needs as a lever for motivation.
Understanding what truly fuels each person (recognition for work, playful contact, calm, excitement, recognition as a person, conviction) gives managers a concrete, everyday lever.
Its limits
PCM is richer, and therefore more demanding: it requires genuine training time to be used accurately, and a personality inventory debriefed by a certified practitioner.
The cost of the Personality Inventory can also be an obstacle for one-off use with a large group.
When we offer it:
- Management and leadership,
- Conflict management and tense situations,
- In-depth team cohesion,
- Coaching for executives facing stress,
- Communication in high-stakes environments.
The Big Five: the research benchmark
What it sheds light on
The product of decades of psychological research, consolidated in the 1980s and 1990s notably by Lewis Goldberg, Paul Costa and Robert McCrae, the Big Five (or OCEAN model) describes personality through five broad traits: Openness to experience, Conscientiousness, Extraversion, Agreeableness and Neuroticism (often presented by its positive side: Emotional Stability). Here, there are no types and no boxes: everyone sits on a continuum for each trait, compared with a reference population.
Its great strength: scientific robustness
It is today the personality model most studied by academic research: its five factors are found across many languages and cultures, remain relatively stable in adulthood and are associated, in documented ways, with realities such as health, academic success or certain aspects of working life. It also sheds light on the other models: four of its traits overlap fairly well with the MBTI dimensions (Extraversion with Extraversion/Introversion, Openness with Intuition, Agreeableness with Feeling, Conscientiousness with Judging). The fifth, emotional stability, has no equivalent in the MBTI: it is precisely the dimension of how we relate to stress, which PCM explores in its own way. And the famous free 16personalities test, often confused with the MBTI, is based on a trait logic close to the Big Five.
Its limits
The Big Five describes, it does not explain: it places you on scales without saying why you function that way, or how to actually talk to someone. It is a model designed for measurement and research, less for dialogue and teaching: percentile scores speak less than a type, a colour or a floor, and some labels ("low agreeableness", "high neuroticism") can hurt if they are not debriefed with care. Finally, quality varies enormously from one questionnaire to another: between a validated inventory administered by a psychologist and a free online quiz, there is a world of difference.
When it is relevant:
- When the need is first and foremost for a scientific or comparative benchmark
- In assessment processes supervised by psychologists, always alongside other elements
- As a backdrop, to inform and put into perspective the reading of the other models.
Summary table: four lenses, four uses
| MBTI | DISC | PCM | Big Five | |
|---|---|---|---|---|
| Central question | Who am I, deep down? | How do I act, how do they act? | How do we talk so we understand each other? | Where do I stand, compared with others? |
| What it describes | Psychological preferences (16 types) | Observable behaviours (4 styles) | Dynamic personality structure (6 types in everyone) | Five traits measured on a continuum (no types) |
| Main asset | Introspective depth | Speed and simplicity | Real-time communication and stress management | Scientific robustness |
| Blind spot | Stress, concrete interaction | Deep motivations | Longer learning curve | Not very operational for communicating: it describes without saying "how to" |
| Ideal ground | Individual coaching, career direction | Sales, team awareness | Management, conflict, lasting cohesion | Research, supervised assessment, background reference |
| Labelling risk | High (the 4-letter badge) | High (the colours) | Lower by design (Base + Phase + 6 floors) | Medium (no boxes, but scores to debrief with care) |
In practice: how to choose between these tools
The right question is not "which is the best model?"
But "what is the need?".
Here is our compass:
- A need to know yourself (transition, review, search for meaning) → MBTI as a way in, for the depth of the inner dialogue.
- A need for a quick common language (sales team, one-day seminar) → DISC, for immediate impact.
- A need to transform day-to-day communication (management, recurring tensions, stress) → PCM, for its finesse and durability.
- A need for a scientific or comparative benchmark (assessment process, wish for a standardised view) → Big Five, for the robustness of its measurement, to be complemented by a more operational model in order to take action.
- Long-term coaching → often a combination: the MBTI opens up self-awareness, PCM equips the relationship with others.
And in every case, the same golden rule: the result of a questionnaire is the start of a conversation, never a verdict.
Frequently asked questions
Can you take all four questionnaires?
Yes, and it is even illuminating: the results do not contradict each other, they complement each other, because they are not looking at the same thing.
However, a debrief with a coach certified in these models is essential, rather than piling up raw results.
Are these models scientifically validated?
Each one is the subject of academic debate, to varying degrees, as is the case with all typological models.
Our position as practitioners: they are tools for dialogue and development, not instruments for measurement or selection. Used within that framework, with a certified professional, their value is proven in the field.
The Big Five is the exception: it is the benchmark model of research, the most statistically robust. But robust measurement does not mean useful for communicating: that is why we see it as a backdrop, not as a substitute for dialogue tools.
Can an employer use these tests to recruit or assess?
That is neither their purpose nor a practice we recommend.
None of these models predicts performance, and reducing an application to a profile would be precisely the labelling use this article warns against.
One nuance: in research, certain Big Five traits (notably conscientiousness) are modestly linked to job performance. That is why validated inventories derived from this model are sometimes used in recruitment by psychologists: always as one element among others, never as the sole criterion.
Can my profile change?
Your deep preferences are stable, but the way you live them evolves.
PCM even models this explicitly with the Phase change. One more reason never to lock yourself, or others, into a result.
