Introverts (I) tend to be contemplative, reserved and withdrawn. It is a widespread misconception that Introverts are shy: they don’t have to be. They draw their energy from their own thoughts and from the time they spend alone. Introverts do not have a constant need for people around them.
Sensors (S) live in the now. They rely on factual information and evidence, they are capable of dealing with practical matters, and they enjoy it when things are concrete and measurable.
Thinkers (T) make decisions based on logic and non-personal evaluation. They use their brain to think and not their hearts.
Judgers (J) prefer a lifestyle that is energetic, planned and ordered. They like an organized and controlled life.
An ISTJ in a nutshell:
An ISTJ is a down-to-earth personality, reserved, extremely responsible and reliable.
ISTJs mean what they say and say what they mean.
People justifiably trust them. They are careful and hold traditional values. They have a strong ability to concentrate and focus on what is needed to accomplish their task.
ISTJs bring any task to a successful completion and are fully committed to it at the same time.
They do not feel attacked by constructive criticism and keep a cool head when others lose control.
While they have an eye for the feelings of others, ISTJs can remain extremely objective and make difficult decisions where necessary.
ISTJs are not particularly extroverted and may find it difficult to be spontaneous. Because of their reserved nature, you’ll not find them boasting about their achievements.
They may be inclined to hide their strengths and their sense of dry humour.
On other occasions, ISTJ’s will surprise and amuse people with their ideas and their humorous outlook on life