What does INFP-T mean?

The -T (Turbulent) is a fifth dimension added by 16Personalities, not part of the original MBTI. It reflects a tendency toward self-doubt, stress-sensitivity, and striving; -A (Assertive) reflects steadiness and lower reactivity. It maps closely to the Big Five trait of emotional stability.

No. Turbulent types tend to be more self-aware, more driven to improve, and more reactive to stress. Assertive types are steadier but can miss signals. Both have costs and strengths.

The Insight Game › Guides › Turbulent vs. Assertive: What the -T and -A in Your Type Actually Mean

How Type Works

Turbulent vs. Assertive: What the -T and -A in Your Type Actually Mean

By Michael A. RoBards, LCSW

If you got INFP-T or ENTJ-A and wondered what the last letter was doing there, you are asking the right question. That letter is not part of the original Myers-Briggs system at all. It is an addition by 16Personalities, and, honestly, it may be the most meaningful thing on their results page.

Where it comes from

The four classic dimensions come from Jung by way of Myers. The fifth — Identity, scored as Assertive or Turbulent — is 16Personalities' own, and it lines up closely with the Big Five trait psychologists call Neuroticism or, more kindly, emotional stability. It is measuring how reactive you are: how strongly you feel stress, how much you second-guess yourself, how easily you are rattled.

What Turbulent looks like

Sensitive to stress; feels setbacks intensely
Self-questioning; notices and worries about mistakes
Driven to improve, often by dissatisfaction with the current version of themselves
Perfectionist tendencies; harder on self than on others

What Assertive looks like

Steady under pressure; setbacks roll off
Comfortable with their choices; less rumination
Confident, sometimes to the point of missing signals
Less likely to be driven by self-improvement anxiety

Why I think it is the useful part

Of the five dimensions on that test, emotional stability is the one with the strongest research behind it and the most direct link to wellbeing. It is also a spectrum, and where you sit on it matters for daily life in a way the four-letter type often does not. A Turbulent person and an Assertive person with the same four letters will experience the same week completely differently.

As a therapist, I would rather know someone's -T or -A than their J or P. It tells me how much of their suffering is coming from the situation and how much from the way their nervous system responds to it — and that changes what actually helps.

Is Turbulent bad?

No, and this is worth saying clearly, because the word does not do Turbulent people any favors. Turbulence comes with self-awareness, empathy, conscientiousness, and a drive to grow. Its cost is that it hurts more. Assertiveness comes with steadiness and resilience; its cost is that it can miss what others are feeling and stop improving. Neither is the good one. Both need the other one's strengths.

Can it change?

More than the four letters can. Emotional reactivity responds to sleep, exercise, therapy, medication, and simply getting older. If you were strongly Turbulent at twenty-two and closer to the middle at forty, that is common, and it is usually good news.

The short version: -A/-T is not part of your type. It is a separate, well-supported measure of how much things get to you. Turbulent feels more and grows more; Assertive weathers more and notices less. Know which one you are and plan your self-care around it.

Play the free 5-minute Insight Game →

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.