 Another leading author in argumentation theory is Douglas Walton, who pioneered the argument schemes approach to argumentation that borrows tools from formal logic but expands them so as to treat a wider range of arguments than those covered by traditional logical systems (Walton, Reed, &amp; Macagno 2008). Walton also formulated an influential account of argumentation in dialogue in collaboration with Erik Krabbe (Walton &amp; Krabbe 1995). Ralph Johnson and Anthony Blair further helped to consolidate the field of argumentation theory and informal logic by founding the Centre for Research in Reasoning, Argumentation, and Rhetoric in Windsor (Ontario, Canada), and by initiating the journal Informal Logic. Their textbook Logical Self-Defense (Johnson &amp; Blair 1977) has also been particularly influential.