 Debunkers, on the other hand, hold that the so-called “problem of logical constants” is a pseudoproblem (Bolzano 1929, §186; Lakoff 1970, 252–4; Coffa 1975; Etchemendy 1983, 1990, ch. 9; Barwise and Feferman 1985, 6; Read 1994). They do not dispute that logicians have traditionally concerned themselves with argument forms in which a limited number of expressions occur essentially. What they deny is that these expressions and argument forms define the subject matter of logic. On their view, logic is concerned with validity simpliciter, not just validity that holds in virtue of a limited set of “logical forms.” The logician’s method for studying validity is to classify arguments by their forms, but these forms (and the logical constants that in part define them) are logic’s tools, not its subject matter. The forms and constants with which logicians are concerned at a particular point in the development of logic are just a reflection of the logicians’ progress (up to that point) in systematically classifying valid inferences. Asking what is special about these forms and constants is thus a bit like asking what is special about the mountains that can be climbed in a day: “The information so derived will be too closely dependent upon the skill of the climber to tell us much about geography” (Coffa 1975, 114). What makes people logicians is not their concern with “and”, “or”, and “not”, but their concern with validity, consequence, consistency, and proof, and the distinctive methods they bring to their investigations.