The ISTP is primarily a thinker. With introverted thinking (Ti), otherwise known as subjective logic, as their primary function, and extroverted sensing (Se), otherwise known as objective sensation, as their secondary function, the ISTP is naturally in a state of mental organization. Without even realizing it, the ISTP is organizing the world in their mind at all times, prioritizing people and items as they apply to the ISTPs goals. This personality is the system builder. As they value extroverted feeling, they are fairly approachable and easy to get along with depending on how much they value their extroverted sensing. When an ISTP recieves information, the information immediately is synthesized, analyzed, and sorted through. This behavior manifests either by them thinking out loud when they are around others, or by isolating themselves from the world and journaling their thoughts.

The world of subjective logic is one where possibilities, theories and questions are constantly being asked. Do aliens exist? What steps should I take to make my gas milage more efficient? What is my purpose in life? This realm of subjective logic (Ti) is entirely theoretical, until put into practice and made tangible and objective by utilizing objective sensation (Se). Often times, ISTPs will get into ruts where they are running out of new information to fuel their ever going thought process; a process of sorting and analyzing thoughts and experiences. When an ISTP gets into this rut where they no longer have any new information, they can begin to think themselves in circles and become highly unproductive. When this happens, they need to venture out into the world and experience more, in order to resume their reflection period. Their view of the world, the system by which they understand the world, is part of their identity.

When an ISTP does not utilize their Se enough, they can become melancholy and depressed; a lost soul. As ISTPs are introverted and in tune with themselves, they are aware of their internal processes. They can create vast landscapes, stories, and worlds in their minds. Many ISTPs become writers. Many have a taste for the mystical, the unexplained. They can search for intensity and emotional stimulation, and can completely envelope themselves in their inner worlds, to the point that the external world becomes a lost meaningless effort. As they recluse, a recursive alienation can form to where they distance themselves from others until they eventually feel “thrown out” by society. That society no longer cares about them.

When an ISTP capitalizes on his strengths of Ti and Se, the ISTP can become incredibly forceful, strong willed, and able to read and understand other people. They can become heroic and inspiring as leaders, able to save others from misfortunes the ISTP has overcome themselves. As they continue to move and progress through life they can avoid these ruts and hydroplane through life, accomplishing more and pondering less. They often feel aimless, and once they have identified a cause for which to align themselves, they fervently execute the vision of that leader. They need a partner with a strong positive vision of the future who they can successful implement and bring to reality.

Physically, ISTPs are rigid pillars, and when they express themselves, they are surprisingly colorful; a stark contrast from their usual monochromatic appearance. They stand firm and upright and are rather abrupt in their emotional expression. They completely mock the idea that their body is a delicate temple that needs to be well kept. Of any personality, an ISTP is the most likely to walk 10 miles to work in flip flops, only to cut his feet  up on the asphalt, and then after washing off his cut and torn feet, say ‘hmmf’ and continue on without caring. When walking, they are prone to shuffling.

ISTPs are a combination of philosophical thinkers, rigid and stubborn system builders, and hard working Spartans. Unlike their ESTP cousins, they can work long hours in under stimulating environments without developing neuroses. They need someone who can provide a vision that they can execute. Their best match is the ENFJ.

Common Identities: The Mystic, The Spartan, The Inspector, The Analyst, The Expert, The Controller, The Dystopian Cyber punk, The Hacker, The Secret Protector, The Ninja, the Revolutionary writer, The Wanderer, The Rational Artist, The Executor.

Recommended Careers: Construction, Information Technology, Teacher, Technician/mechanic, Policeman, Management, Entrepreneur, Travel Guide, artist, Business Executor, Writer.


Common Enneagram typings are: 3 5 6 9

Famous ISTPs include: Dr. Phil, Clint Eastwood, Vladmir Putin, Meg Ryan, Seth Greene, Kurt Russel, Robin Wright, Jackie Earle Haley, John Malkovich, Elias Toufexis, Sean Penn, Daniel Craig, Ashley Judd, Alice Eve, Avril Lavigne.

Fictional ISTPs: Snake Pliskin, Dirty Harry, Raiden (Metal Gear Solid), Lydia (Skyrim), Sally Acorn (Sonic Satam), Sarah Kerrigan (Starcraft), Vincent Valentine (Final Fantasy 7)

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