In this overview article, we first explain what we take informal logic to be, discussing misconceptions and distinguishing our conception of it from competing ones; second, we briefly catalogue recent informal logic research, under 14 headings; third, we suggest four broad areas of problems and questions for future research; fourth, we describe current scholarly resources for informal logic; fifth, we discuss three implications of informal logic for philosophy in particular, and take note ofpractical consequences of a more general sort.

Inference is elementary and ubiquitous: Cognition always goes beyond the data. Thinking—including problem solving, decision making, judgement, planning, and argumentation—is here defined as the deliberate application and coordination of one's inferences to serve one's purposes. Reasoning, in turn, is epistemologically self-constrained thinking in which the application and coordination of inferences is guided by a metacognitive commitment to what are deemed to be justifiable inferential norms. The construction of rationality, in this view, involves increasing consciousness and control of logical and other (...) inferences. This metacognitive conception of rationality begins with logic rather than ending with it, and allows for developmental progress without positing a state of maturity. (shrink)

In Tractatus Logico‐Philosophicus (TLP), Wittgenstein gave ethics the same semantic status as logic. This paper first investigates this claim from the perspective of Wittgenstein’s lifelong semantic framework. This reveals that ethical sentences are meaningless expressions, which can only be used to ostensively point out conditions of meaningfulness. Secondly, the paper assesses the implications of this conclusion for understanding the seven cryptic remarks on value and ethics in TLP. Using the connection between will and value in TLP and will and sentence (...) interpretation in Philosophical Investigations, it is suggested that Wittgenstein held lifelong views on value and ethics. (shrink)

The last half of this century witnessed a proliferation of competing and complimentary theories of argumentation, initiated by the methodological shift from the "product" to the "process" of argument. This paper considers the effect of that shift by c omparing the different logical and epistemic status various theories assign to the standards of argument analysis and evaluation. In view of such differences, I argue that the systematic study of argumentation must clearly demarcate the normative and emp irical study of argumentation (...) with sensitivity to both the limit and significance of each. (shrink)