Grennan bases his evaluation of arguments on two criteria: logical adequacy and pragmatic adequacy. He asserts that the common formal logic systems, while logically sound, are not very useful for evaluating everyday inferences, which are almost all deductively invalid as stated. Turning to informal logic, he points out that while more recent informal logic and critical thinking texts are superior in that their authors recognize the need to evaluate everyday arguments inductively, they typically cover only inductive fallacies, ignoring the inductively sound patterns frequently used in successful persuasion. To redress these problems, Grennan introduces a variety of additional inductive patterns. Concluding that informal logic texts do not encourage precision in evaluating arguments, Grennan proposes a new argument evaluation procedure that expresses judgments of inferential strength in terms of probabilities. Based on theories of Stephen Toulmin, Roderick Chisholm, and John Pollock, his proposed system allows for a more precise judgment of the persuasive force of arguments.

Informal Logic: Issues and Techniques

Politics & Social Sciences

Grennan, Wayne

Philosophy

Acumen Publishing

<p>In this book the author argues that the traditional buy-and-hold strategy for stock and mutual fund investing is obsolete and ineffective. A better approach to timing buys and sells, called the TrendPoint! approach, is presented. The timing approach is momentum-based, but stock selection is done on the basis of fundamentals, so up-to-date advice on the best evaluation parameters is also presented.</p>

Investing: More Success with Less Stress

Business & Money

Investing

Timberlea Pr

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