However, the concept of personality types like INTJ is derived from the Myers-Briggs Type Indicator (MBTI), a psychological assessment tool used to categorize individuals based on their preferences in how they perceive the world and make decisions. People typically determine their MBTI type by taking a test or self-assessment, answering a series of questions designed to identify their personality preferences.
If you have any questions about INTJs or the MBTI system, feel free to ask, and I'd be happy to provide information!