A basic idea of situation theory is that there is a concrete reality, which has concrete parts but not concrete alternatives. This reality can be thought about, perceived, studied and analyzed in a variety of different ways, from a variety of different perspectives, for a variety of different purposes. But ultimately everything that exists, everything that happens, everything that is true, has its status because of the nature of this reality. The parts of reality are what we call situations. Situation theory is committed to there being situations, but not to there being a largest total situation of which the rest are parts.