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Published online by Cambridge University Press: 28 February 2022
Every inquiry, or at least every inquiry that aims at knowledge, has a subject-matter - that which the inquiry is about, which is the object or set of objects studied. Let us, for the sake of brevity, and without further analysis for the present, call the set of things studied in an investigation the domain of the inquiry, and the particular things that make up the domain the items of the domain. (These “items” might, in particular inquiries, be spoken of as “objects,” “processes,” “behavior,” “facts,” or in still other ways; but such ways of speaking involve problems which, being irrelevant to present purposes, I wish to avoid by speaking more generally of “items.” Sometimes it is convenient to speak of classes of items as themselves items which are objects of investigation.)