As an ISTP, your primary mode of living is focused internally, where you deal with things rationally and logically. Your secondary mode is external, where you take things in via your five senses in a literal, concrete fashion.
ISTPs have a compelling drive to understand the way things work. They're good at logical analysis, and like to use it on practical concerns. They typically have strong powers of reasoning, although they're not interested in theories or concepts unless they can see a practical application. They like to take things apart and see the way they work.
