Proto Sociology An International Journal of Interdisciplinary Research VOL. 13, 1999 REASONING AND ARGUMENTATION Dieter Mans, Gerhard Preyer (eds.) Content Introduction: On Contemporary Developments in the Theory of Argumentation Gerhard Preyer, Dieter Mans 3 Ralph H. Johnson Reasoning, Argumentation and The Network Problem 14 Leo Groarke The Fox and the Hedgehog: On Logic, Argument, and Argumentation Theory 29 J. Anthony Blair Presumptive Reasoning/Argument: An Overlooked Class 46 Robert C. Pinto Argument Schemes and the Evaluation of Presumptive Reasoning: some Reflections on Blair’s Account 61 Douglas Walton The New Dialectic: A Method of Evaluating an Argument Used for Some Purpose in a Given Case 70 Manfred Kienpointner Comments on Douglas Walton’s Paper: The New Dialectic: A Method of Evaluating an Argument Used for Some Purpose in a Given Case 92 Christopher W. Tindale The Authority of Testimony 96