A self-description of the journal appears in the first issue, July of 1978:
However, as we found out at the Windsor Symposium, informal logic means many things to many people. Let us then declare our conception of it. For the time being, we shall use this term to denote a wide spectrum of interests and questions, whose only common link may appear to be that they do not readily lend themselves to treatment in the pages of “The Journal of Symbolic Logic.” More positively, we think of informal logic as covering the gamut of theoretical and practical issues that come into focus when one examines closely, from a normative viewpoint, the reasoning that people actually engage in. Subtract from this the exclusively formal issues and what remains is informal logic. Thus our conception is very broad and liberal, and covers everything from theoretical issues (theory of fallacy and argument) to practical ones (such as how best to display the structure of ordinary arguments) to pedagogical questions (how to design critical thinking courses; what sorts of material to use). [I changed the underlining of "The Journal of Sybolic Logic" to quotes to avoid confusion with hyperlinking. Emphasis added.]
“…the reasoning that people actually engage in” sounds like it would interest topic map authors.
Jack Park forwarded this to my attention.