This mod requires LOT51 Core Library

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In Brief:

This mod adds the 16 personalities from the MBTI Theory into the Sims 4. They affect the gameplay but are mostly meant to sit in the background and integrate with personality traits to make Sims more rounded. A lot of things work in the background.

Assigning MBTI Profile:

Personalities can be assigned by taking the MBTI test from the PC or phone:

There are two tests, they give different results but both rely on your sims pre-existing personality traits. You can retake the test as many times you want if you want to get different results (you can also use my debug cheats to force a result or pick a specific one), the official test most likely will always give the same one though, we used the cognitive functions and associated them to Maxis traits to get the results so it's pretty consistent.

NPCs will also take the test and type themselves.

MBTI Typing Skill:

Taking the test will give you the MBTI typing skill:

This is a pretty easy to increase skill because it goes up with social interactions, the more your Sim interacts with other Sims the better they'll be at understanding other's personalities. It's so easy because it unlocks social interactions and among them the ability to type NPCs: