By Michael A. RoBards, LCSW
People argue about which personality system is “right” as if they were competing for the same job. They are not. Each one answers a different question, and once you see that, the argument mostly dissolves.
Question it answers: where do you sit on five well-established trait dimensions (Openness, Conscientiousness, Extraversion, Agreeableness, Neuroticism)?
Strengths: this is the model most personality researchers use, and for good reason. It reports continuous scores instead of binary types, it has strong reliability over time, and it actually predicts things — job performance, relationship outcomes, health behaviors. If you want the most accurate map of yourself, this is it.
Weakness: it is not memorable and not much fun. “High Openness, moderate Conscientiousness, low Neuroticism” is true and useful and nobody puts it in their dating profile.
Question it answers: how do you tend to take in information and make decisions, and which direction does your energy point?
Strengths: it gives people a shared language. Four letters you can remember, sixteen profiles you can recognize yourself in, and a vocabulary for talking about differences with a partner or a team. That is genuinely valuable and it is why the system persists despite the criticism.
Weakness: the binary sorting. It measures traits that overlap heavily with the Big Five (the extraversion scales correlate around .74; McCrae & Costa, 1989) but throws away the score and keeps only the side, which is why about half of people get a different type on retest. It should never be used for hiring or high-stakes decisions.
Question it answers: what are you afraid of, what are you chasing, and what do you do when you are not okay?
Strengths: depth. Where MBTI describes how you process, the Enneagram describes why you do what you do — the core fear and desire underneath the behavior. In therapy it is often the most useful of the three, because it points straight at the pattern a person is trying to change.
Weakness: the least scientific of the three. Its origins are contemplative rather than empirical, and validation research is limited. Hold it as a lens, not a measurement.
Big Five when I want an accurate baseline. MBTI when a couple or family needs a language for their differences. Enneagram when someone is stuck in a pattern and needs to see what it is protecting. They are not rivals; they are three angles on the same person.
The Insight Game is built on the clinical Type and Temperament work of Dr. Martine J. RoBards, Ph.D. (1946–2017). Live community accuracy data is on the research page.