 Nevertheless, in the twentieth century a number of authors took inspiration from developments in formal logic and expanded the use of logical tools to the analysis of ordinary argumentation. A pioneer in this tradition is Susan Stebbing, who wrote what can be seen as the first textbook in analytic philosophy, and then went on to write a number of books aimed at a general audience addressing everyday and public discourse from a philosophical/logical perspective (see entry on  Susan Stebbing).  Her 1939 book Thinking to Some Purpose, which can be considered as one of the first textbooks in critical thinking, was widely read at the time, but did not become particularly influential for the development of argumentation theory in the decades to follow.