With other people, since I can't get completely inside their minds, it's more piecing together all the intuitive emotional impressions I've picked up from them combine with the nuances of their behavior and connecting it to other people having those same characteristics and seeing where it leads. What comes out is a picture of someone's psyche. I do that with myself too, but somehow it's less easy because of all the conflicting emotions. When you can see everything it's harder to decide what's relevant.
Ene said with building systems makes sense according to whether it is people-focused or maybe process focused. (I don't know if that would best describe Te since I'm not that good with the function- INTJ's feel free to elaborate on this point.)