type dynamics, life journey and the

Your four-letter MBTI code of ISTJ reveals your four personality traits. How your diferent traits interact with each other is called 'type dynamics'. Over your life, you will use different traits more often, as well as more easily.

Check out this short video from TypeLabs that explains MBTI type dynamics for ISTJ personality types.

Your MBTI 'mental muscles'

Of the four letters in your MBTI personality code, the most important are the middle two – your so-called 'mental muscles'. For ISTJs, these are S for Sensing and T for Thinking.

As introverts, the dominant function of ISTJs is indicated by the second letter of their code, S for Sensing, which ISTJs use in their internal world.

Their second-favoured or auxiliary function is shown by the third letter of their code, T for Thinking, which ISTJs use in the outer world.

A balanced personality

Your Dominant Function or 'mental muscle' has the most important role in guiding you. It is the function you trust the most, and you are most energised when using it.

If your Dominant Function is the captain of your ship, your Auxiliary Function is the first mate. As an introvert, you use it in your least favoured (outer) world. In this way your Auxiliary Function adds balance to your life, and its full development helps you become a more rounded personality.

Introverted Sensing (Si)


As your dominant function, Introverted Sensing (Si) leads you to continually gather information from the world around you – and then store it away in your warehouse-like memory for later recall. In fact, you are able not merely to recall the past, but to relive it, almost as if you were there again. In great detail you can compare past details – whether about people, places or events – with the present ones and notice what is different and what has remained the same.

You have a fear of the unknown and the unpredictable that makes you cautious in life. As an everyday example, you would typically allow some extra time when leaving on a trip – you never know what could happen to disrupt your journey and make you late.

Because you view the outer world as full of potential hazards that could strike at any stage, you follow a personal set of goals, commitments and priorities that you rely on as a type of map to guide you through life.

Extraverted Thinking (Te)


Supporting and balancing your dominant, inner-focused of Si is your outwardly-directed auxiliary function of Extraverted Thinking (Te). Your Te is like a giant sponge that soaks ups information from the everyday world around you. Always organising and categorising things, your Te looks for order and patterns, and is very focused on understanding of how one choice or event causes another to happen as a result.

But Te is not interested in information for its own sake; Te is interested in 'news it can use' so that it can better realise its goals in the outer world.

Introverted Feeling (Fe)


The Introverted Feeling function provides a person with a type of internal radar than enables them to see through others and know what they are really like. Attuned to subtle distinctions, Fi innately senses what is true and what is false. Only when Fi identifies a person with similar values is there a desire to form a connection.

How Fi makes these judgements about others is difficult to put into words, because it is often based images, feelings and gut reactions more than words. As a cognitive process, it often serves as a filter for information that matches what is valued, wanted, or worth believing in. There can be a continual weighing of the situational worth or importance of everything and a patient balancing of the core issues of peace and conflict in life situations.

Extraverted iNtuition (Ni)


As an inferior function Ne can lead an ISTJ to a mindset of total negativity and pessimism. You may become uncharacteristically spontaneous, thoughtless and impulsive – perhaps even doing no work for long periods of time. You may lose your usual ability to organise facts and details logically. And your obsessive thinking about problems can lead to many sleepless nights. In its most extreme form, Ne can lead an MBTI to totally shutting down.

References: Personality Pathways, British Association for Psychological Type, Team Technology, New Directions Consulting, Center for Applications of Psychological Type, The Myers Myers The Myers Myers & Briggs Foundation, Was That Really Me? by Naomi L. Quenk.