If you aren't sure whether you are Ti dominant, I think I might be able to help you. For types with Ti as a leading function, logic is a way of life. For most other types, it is not. I believe that I'm an ethical type. Therefore, for me, logic is an artform, a tool. It's a tool that I take a lot of pride in, but I could never live by logical rules. It's something I use a lot, but it is flexible and never set in stone. It is also something I use to justify my values and intuitions after the fact. These are what I believe to be the key differences between L_Is and all other types (except perhaps L_Es, who live by practical logic). What do you think?