These are the two poles of the Identity trait added by the 16Personalities questionnaire, shown as -A or -T after a four-letter type. Assertive means self-assured and even-tempered under pressure; Turbulent means self-conscious and success-driven, more sensitive to stress. It is not part of standard Myers-Briggs typology.
The core difference
- Assertive (-A) — confident, resistant to stress, less prone to second-guessing decisions.
- Turbulent (-T) — self-conscious, perfectionist, more emotionally reactive and more driven by dissatisfaction.
What the suffix actually is
Written as INFP-A or ENTJ-T, it is a fifth dimension layered on top of the four-letter code. It maps closely to the trait called neuroticism or emotional stability in the Big Five model, which is the most empirically supported personality framework in psychology.
It is not part of the Myers-Briggs Type Indicator. The official MBTI produces four letters only, so a -A or -T suffix indicates the free 16Personalities questionnaire rather than the MBTI instrument.
Neither pole is better
The framing is deliberately even-handed. Assertive individuals report more contentment and steadier confidence, but can be less inclined to examine their own performance. Turbulent individuals report more stress and more self-criticism, and also more drive to improve. The trade-off is between equanimity and dissatisfaction as a motivator.
How the Big Five differs
Worth knowing if you want the research rather than the questionnaire. The Big Five measures five traits on continuous scales rather than sorting people into sixteen boxes, and it is what academic psychology actually uses:
- Openness · Conscientiousness · Extraversion · Agreeableness · Neuroticism
Type systems have been widely criticised for treating continuous traits as categories, since most people score near the middle on any given dimension and can therefore flip type between sittings.
Where the words come from
Assertive is from Latin asserere, to claim or join to oneself. Turbulent is from Latin turba, a crowd or commotion — the same root as disturb and turbine. The image is of agitation rather than of weakness.
Frequently asked questions
What does the -A or -T mean in a personality type?
It is the Identity trait from the 16Personalities questionnaire. Assertive means self-assured and even-tempered; Turbulent means self-conscious and success-driven.
Is Assertive-Turbulent part of Myers-Briggs?
No. The official MBTI produces four letters only. The fifth letter comes from the free 16Personalities test and maps closely to neuroticism in the Big Five.
Is one better than the other?
Neither. Assertive types report steadier confidence; Turbulent types report more stress but also more drive to improve.