ISTP

ISTP (Introversion, Sensing, Thinking, Perception) is an abbreviation used in the publications of the Myers-Briggs Type Indicator (MBTI) to refer to one of sixteen personality types. The MBTI assessment was developed from the work of prominent psychiatrist Carl G. Jung in his book Psychological Types. Jung proposed a psychological typology based on the theories of cognitive functions that he developed through his clinical observations.

From Jung's work, others developed psychological typologies. Jungian personality assessments include the MBTI assessment, developed by Isabel Briggs Myers and Katharine Cook Briggs, and the Keirsey Temperament Sorter, developed by David Keirsey. Keirsey referred to ISTPs as Crafters, one of the four types belonging to the temperament he called the Artisan. According to the Center for Applications of Psychological Type, 4–6% of the United States population are ISTP.

The MBTI instrument

 * I – Introversion preferred to extraversion: ISTPs tend to be quiet and reserved. They generally prefer interacting with a few close friends rather than a wide circle of acquaintances, and they expend energy in social situations (whereas extroverts gain energy).
 * S – Sensing preferred to intuition: ISTPs tend to be more concrete than abstract. They focus their attention on the details rather than the big picture, and on immediate realities rather than future possibilities.
 * T – Thinking preferred to feeling: ISTPs tend to rely on objective criteria rather than personal values. When making decisions, they generally give more weight to logic than to social considerations.
 * P – Perception preferred to judgment: ISTPs tend to withhold judgment and delay important decisions, preferring to "keep their options open" should circumstances change.

Myers-Briggs description
According to Myers-Briggs, ISTPs excel at analyzing situations to reach the heart of a problem so that they can swiftly implement a functional repair, making them ideally suited to the field of engineering. Naturally quiet people, they are interested in understanding how systems operate, focusing on efficient operation and structure. But contrary to their seemingly detached nature, ISTPs are often capable of humorously insightful observations about the world around them, and will display a seemingly uncharacteristic enthusiasm for things of great interest to them. ISTPs abhor waste (be it in time, effort, and/or resources) but are highly adaptable, making them receptive to new information and approaches. They enjoy exploring new things, and can become bored with repetitiveness and routine. They can also be closet daredevils who gravitate toward fast-moving or risky hobbies (such as bungee jumping, hang gliding, racing, motorcycling, and skydiving), recreational sports (such as downhill skiing, paintball, ice hockey, and scuba diving), and careers (such as aviation, EMT, and firefighting).

ISTPs may sometimes seem to act without regard for procedures, directions, protocol, or even their own safety. But while their approach may seem haphazard, it is in fact based on a broad store of knowledge collected over time through quiet action and keen observation. The upside of this characteristic is that ISTPs often excel in high-pressure and/or emergency situations, where their knowledge and experience can be immediately brought to bear — usually with the ISTP's characteristic unflappability. When others are just beginning to grasp the details of the situation, ISTPs are often (and sometimes from the perspective of those familiar with the ISTP, unexpectedly) resolving it. In personal matters, ISTPs enjoy self-sufficiency and take pride in developing their own solutions to problems.

ISTPs can often be a frustration to their friends or partners due to a combination of mixed social signals and a propensity to ignore everyone while deeply absorbed in a favored task. While ISTPs will readily participate in group activities that hold immediate interest for them — and can be a great source of entertainment for all who participate — they will often eschew (either partially or entirely) the routine social interactions surrounding those group activities. Without intending any insult, the ISTP often concludes that such interactions — those that others might view as cordial or even expected — are redundant and superfluous; for the ISTP, the social event ended when the activity of interest concluded. Such behavior is often misinterpreted by others as an actively antisocial attitude when in fact ISTPs are simply uninterested in engaging in group-related small-talk. Should a topic of interest come up, the ISTP may suddenly re-engage the social group, only to disengage almost as abruptly when the topic passes. The ISTP should be mindful that their tendency toward aloofness (be it real or perceived) could have a negative impact on otherwise great relationships.

ISTPs are content to let others live according to their own rules and preferences — as long as the favor is reciprocated. It has been observed that a slogan that best describes this ISTP attitude is "Don't Tread On Me." ISTPs will endure reasonable impositions without complaint; but if their "territory" is encroached upon, eroded, or violated, their quiet, easy-going nature is quickly abandoned in favor of stubborn, staunch, and uncharacteristically vocal defense of what they view as rightfully theirs — and those around the once laissez faire ISTP suddenly find themselves off-guard and unexpectedly "walking on eggshells." Unfortunately for others, often only the ISTP knows at which point this line will be crossed — providing yet another potential source of mixed signals with which ISTPs inadvertently surprise those around them.

Keirsey description
According to Keirsey, Crafter Artisans are masters at using tools of every type—artistic, technological, martial. Although they are introverts, they are authoritarian in their interactions with others and can be forceful at influencing people. They focus on accomplishing tasks efficiently and skillfully.

To master the tool of their interest, ISTPs require a certain degree of seclusion in which to practice. The result is often a virtuosity that other types find difficult to match.

Cognitive functions
Using the more modern interpretation, the cognitive functions of the ISTP are as follows:

Dominant: Introverted thinking (Ti)
Ti seeks precision, such as the exact word to express an idea. It notices the minute distinctions that define the essence of things, then analyzes and classifies them. Ti examines all sides of an issue, looking to solve problems while minimizing effort and risk. It uses models to root out logical inconsistency. ISTPs live in a world of logic, on which they base their decisions. They process information from their auxiliary function to create strategies for action at a moment's notice. They love to examine complicated systems.

Auxiliary: Extraverted sensing (Se)
Se focuses on the experiences and sensations of the immediate, physical world. With an acute awareness of the present surroundings, it brings relevant facts and details to the forefront and may lead to spontaneous action. This function drives ISTPs to embrace opportunities to plunge headfirst into experiences. It also gives them a keen insight into situations similar to that of the ISTJ. Their curiosity for the world around them gives them a "leap before you look" tendency. They are notorious for taking apart a device to see how it works before considering whether they can put it back together.

Tertiary: Introverted intuition (Ni)
Attracted to symbolic actions or devices, Ni synthesizes seeming paradoxes to create the previously unimagined. These realizations come with a certainty that demands action to fulfill a new vision of the future, solutions that may include complex systems or universal truths. Never as open in their theorizing as INTPs, ISTPs prefer to keep themselves grounded in the physical situation, using Ni to visualize components and concepts that they cannot see and touch firsthand, such as the wiring in a circuit board.

Inferior: Extraverted feeling (Fe)
Fe seeks social connections and creates harmonious interactions through polite, considerate, and appropriate behavior. Fe responds to the explicit (and implicit) wants of others, and may even create an internal conflict between the subject’s own needs and the desire to meet the needs of others. A weak point of ISTPs, Fe may lead them to interpret criticisms of their ideas as criticisms of their competence. ISTPs strive to follow the edicts of logic, but when they are under stress, their inferior function can lead them to illogically and stubbornly cling to their own ideas—sometimes to their own detriment, or even when proven wrong.

Shadow functions
Later personality researchers (notably Linda V. Berens) added four additional functions to the descending hierarchy, the so-called "shadow" functions to which the individual is not naturally inclined but which can emerge when the person is under stress. For ISTP, these shadow functions are (in order):


 * Extraverted thinking (Te): Te organizes and schedules ideas and the environment to ensure the efficient, productive pursuit of objectives. Te seeks logical explanations for actions, events, and conclusions, looking for faulty reasoning and lapses in sequence.
 * Introverted sensing (Si): Si collects data in the present moment and compares it with past experiences, a process that sometimes evokes the feelings associated with memory, as if the subject were reliving it. Seeking to protect what is familiar, Si draws upon history to form goals and expectations about what will happen in the future.
 * Extraverted intuition (Ne): Ne finds and interprets hidden meanings, using “what if” questions to explore alternatives, allowing multiple possibilities to coexist. This imaginative play weaves together insights and experiences from various sources to form a new whole, which can then become a catalyst to action.
 * Introverted feeling (Fi): Fi filters information based on interpretations of worth, forming judgments according to criteria that are often intangible. Fi constantly balances an internal set of values such as harmony and authenticity. Attuned to subtle distinctions, Fi innately senses what is true and what is false in a situation.