Extroverted Thinking (Te) is the great organizer. Types that have Te as their supporting function (INTJs and ISTJs) use Te to translate the input of their dominant function into functional systems. If the information from the dominant function (Ni for INTJs, Si for ISTJs) is a room filled with boxes of unlabeled documents, Te is the unfortunate intern that is tasked with turning it into a functional records office. Te scrutinizes everything, deciding if it’s relevant or workable or rational. It organizes the stuff worth keeping, and throws out the trash.
Supporting Te is the Judging function for these types. It’s what makes them decisive. When INTJs use their Ni to foresee possible outcomes, it’s what turns these interpretations into plans (and back-up plans.) Te takes the ISTJs experiential data collected by their Si and creates decisions.
The bad news? Te is also what makes these types incredibly stubborn. While still in dominant function processing, these types are open to (and, in fact, looking for) additional information and input, but once their Te has locked onto a plan, decision, or conclusion they will, generally, reject any new data, even if it’s relevant. While this saves them from the indecision that plagues Perceiving types, and helps them stand up for their ideas and convictions, it also occasionally leads them to bowl over others, can make them difficult to work with (and for,) and can make them reject differing ideas or alternate interpretations simply because they conflict with the ones the Te user has already come to.