You're using introverted Thinking or Ti when you're deeply analyzing something. When you're precisely naming and categorizing thoughts and ideas. When you're thinking in models, frameworks, and principles. When you're reaching conclusions while detaching yourself from outside input.
Expats using Ti to decide on an assignment are likely to take an objective, detached point-of-view. They are able to appreciate the complexity and may take time to examine the offer from multiple angles, with the aim of coming to the most accurate decision. It is helpful here to factor in emotional concerns for family members and how the relocation will affect the family system.
If Ti is in different positions in your type dynamics, below is an overview pieced together with only a few items taken from Understanding Yourself and Others, An Introduction to the Personality Type Code, by Linda V. Berens and Dario Nardi. Let me say this again to be very clear: the description of how Ti can be expressed in the different positions is not exhaustive and only meant to give you an overview. I would love to have you comment below how it shows up for you.
If you'd like to practice your Ti skills, find an idea or a theory or a system that interests you and take it apart into tiny little pieces. Dig deep. Be objective. Until you understand how the pieces fit together and are able to extrapolate the underlying principle. Some types may find Sudoku a good exercise as well.