Non-technical in approach, it is based on 186 examples, which Douglas Walton, a leading authority in the field of informal logic, discusses and evaluates in clear, illustrative detail. Non-technical in approach, it is based on 186 examples, which Douglas Walton, a leading authority in the field of informal logic, discusses and evaluates in clear, illustrative detail. Books . "Informal Logic is an introductory guidebook to the basic principles of constructing sound arguments and criticizing bad ones. Request PDF | Informal logic: A pragmatic approach, second edition | Informal Logic is an introductory guidebook to the basic principles of constructing sound arguments and criticizing bad ones. Informal Logic is an introductory guidebook to the basic principles of constructing sound arguments and criticizing bad ones. Try Prime Hello, Sign in Account & Lists Sign in Account & Lists Orders Try Prime Cart. Informal Logic: A Pragmatic Approach by Douglas Walton (2-Jun-2008) Paperback: Books - Amazon.ca Read, download Informal Logic - A Pragmatic Approach for free ( ISBNs: 9780521886178, 9780511406102, 9781107086579 ). Walton explains how errors, fallacies, and other key failures of argument occur. The goal of Informal Logic: A Pragmatic Approach is to help the reader use critical methods to impa rtially and reasonably evaluate the strengths and weaknesses of arguments (p. 1). Skip to main content. Informal Logic: A Pragmatic Approach: MR Douglas Walton: 9780521445825: Books - Amazon.ca. Informal Logic: A Pragmatic Approach, 2nd edition Douglas Walton.