My temperament: INTP
Go take the test at Keirsey
Logical, original, creative thinkers. Can become very excited about theories and ideas. Exceptionally capable and driven to turn theories into clear understandings. Highly value knowledge, competence and logic. Quiet and reserved, hard to get to know well. Individualistic, having no interest in leading or following others.
INTPs live in the world of theoretical possibilities. They see everything in terms of how it could be improved, or what it could be turned into. They live primarily inside their own minds, having the ability to analyze difficult problems, identify patterns, and come up with logical explanations. They seek clarity in everything, and are therefore driven to build knowledge. They are the "absent-minded professors", who highly value intelligence and the ability to apply logic to theories to find solutions. They typically are so strongly driven to turn problems into logical explanations, that they live much of their lives within their own heads, and may not place as much importance or value on the external world. Their natural drive to turn theories into concrete understanding may turn into a feeling of personal responsibility to solve theoretical problems, and help society move towards a higher understanding.
INTPs value knowledge above all else. Their minds are constantly working to generate new theories, or to prove or disprove existing theories. They approach problems and theories with enthusiasm and skepticism, ignoring existing rules and opinions and defining their own approach to the resolution. They seek patterns and logical explanations for anything that interests them. They're usually extremely bright, and able to be objectively critical in their analysis. They love new ideas, and become very excited over abstractions and theories. They love to discuss these concepts with others. They may seem "dreamy" and distant to others, because they spend a lot of time inside their minds musing over theories. They hate to work on routine things - they would much prefer to build complex theoretical solutions, and leave the implementation of the system to others. They are intensely interested in theory, and will put forth tremendous amounts of time and energy into finding a solution to a problem with has piqued their interest.
INTPs do not like to lead or control people. They're very tolerant and flexible in most situations, unless one of their firmly held beliefs has been violated or challenged, in which case they may take a very rigid stance. The INTP is likely to be very shy when it comes to meeting new people. On the other hand, the INTP is very self-confident and gregarious around people they know well, or when discussing theories which they fully understand.
The INTP has no understanding or value for decisions made on the basis of personal subjectivity or feelings. They strive constantly to achieve logical conclusions to problems, and don't understand the importance or relevance of applying subjective emotional considerations to decisions. For this reason, INTPs are usually not in-tune with how people are feeling, and are not naturally well-equiped to meet the emotional needs of others.
The INTP may have a problem with self-aggrandizement and social rebellion, which will interfere with their creative potential. Since their Feeling side is their least developed trait, the INTP may have difficulty giving the warmth and support that is sometimes necessary in intimate relationships. If the INTP doesn't realize the value of attending to other people's feelings, he or she may become overly critical and sarcastic with others. If the INTP is not able to find a place for themself which supports the use of their strongest abilities, they may become generally negative and cynical. If the INTP has not developed their Sensing side sufficiently, they may become unaware of their environment, and exhibit weakness in performing maintenance-type tasks, such as bill-paying and dressing appropriately.
For the INTP, it is extremely important that ideas and facts are expressed correctly and succinctly. They are likely to express themselves in what they believe to be absolute truths. Sometimes, their well thought-out understanding of an idea is not easily understandable by others, but the INTP is not naturally likely to tailor the truth so as to explain it in an understandable way to others. The INTP may be prone to abandoning a project once they have figured it out, moving on to the next thing. It's important that the INTP place importance on expressing their developed theories in understandable ways. In the end, an amazing discovery means nothing if you are the only person who understands it.
The INTP is usually very independent, unconventional, and original. They are not likely to place much value on traditional goals such as popularity and security. They usually have complex characters, and may tend to be restless and temperamental. They are strongly ingenious, and have unconventional thought patterns which allows them to analyze ideas in new ways. Consequently, a lot of scientific breakthroughs in the world have been made by the INTP.
The INTP is at his best when he can work on his theories independently. When given an environment which supports his creative genius and possible eccentricity, the INTP can accomplish truly remarkable things. These are the pioneers of new thoughts in our society.
Rationals are the problem solving temperament, particularly if the problem has to do with the many complex systems that make up the world around us. Rationals might tackle problems in organic systems such as plants and animals, or in mechanical systems such as railroads and computers, or in social systems such as families and companies and governments. But whatever systems fire their curiosity, Rationals will analyze them to understand how they work, so they can figure out how to make them work better.
In working with problems, Rationals try to find solutions that have application in the real world, but they are even more interested in the abstract concepts involved, the fundamental principles or natural laws that underlie the particular case. And they are completely pragmatic about their ways and means of achieving their ends. Rationals don't care about being politically correct. They are interested in the most efficient solutions possible, and will listen to anyone who has something useful to teach them, while disregarding any authority or customary procedure that wastes time and resources.
Rationals have an insatiable hunger to accomplish their goals and will work tirelessly on any project they have set their mind to. They are rigorously logical and fiercely independent in their thinking -- are indeed skeptical of all ideas, even their own -- and they believe they can overcome any obstacle with their will power. Often they are seen as cold and distant, but this is really the absorbed concentration they give to whatever problem they're working on. Whether designing a skyscraper or an experiment, developing a theory or a prototype technology, building an aircraft, a corporation, or a strategic alliance, Rationals value intelligence, in themselves and others, and they pride themselves on the ingenuity they bring to their problem solving.
Rationals are very scarce, comprising as little as 7 to 10 percent of the population. But because of their drive to unlock the secrets of nature, and to develop new technologies, they have done much to shape our world.
Rationals at Work
As a Rational, you seek to acquire and apply expertise. You thrive in an autonomous and intellectually stimulating workplace, working alongside other competent people, pursuing knowledge or creating systems. Your core need to follow the driving force of your own intelligence leads to particular career challenges. For example, recognition of your expertise may lead to your being put "in charge" of other people, as a manager, when you might prefer to remain immersed in projects of your own.
Curious and imaginative, you are happy when you have the opportunity to explore the universe of ideas. You do not usually seek leadership positions and prefer independent work to teamwork. In your ideal job, your superiors create a structure, provide you with resources, set some general expectations, and let you loose. Inasmuch as you are not particularly goal oriented, your ideal job situation provides you a sort of private enclave where you can work autonomously. Like other "creatives" (scientists, computer engineers and even writers and designers), you work best when you can deliver your work products--rather than yourself or your process--to others.
If you read all the above, took the sorter and are an ENTJ, or ESTJ, you are in the car, or at least I have the door open for you.