• Philosophy of Science
  
  
• Informal Reasoning
  
  
• Wittgenstein

Selected Publications:

Books and Collections:

• Critical Thinking: An Introduction to Analytical Reading and Reasoning, Oxford University Press, 2001 [Critical Thinking Online Tutorial]
  
  
• Practical Reasoning, Harcourt Brace Jovanovich, 1989
  
  
• Better Reasoning: Techniques for Handling Argument, Evidence and Abstraction, Holt, Rinehart & Winston, 1982
  
  
• Teleological Explanation, University of California Press, 1976

Recent Articles:

• "Reasoning and Explaining," Argumentation, Vol. 16, 2002, 33-46
  
  
• "Justification, Discovery, Reason & Argument," Argumentation, Vol. 15, 2000, 1-8
  
  
• "Reasons and the Deductive Ideal," Midwest Studies in Philosophy, Vol. 23, 1999
  
  
• "Argument and Deliberation: a Plea for Understanding," The Journal of Philosophy, Vol. 92, No. 11, 1995, 565-85
  
  
• "Induction and Explanation," Philosophical Inquiry, Vol. 4, No. 1, 1982, 1-16
  
  
• "Rival Explanations," Mind, Vol. 82, N.S., No. 328, 1973, 497-515
  
  
• "The Astronomy of Eudoxus: Geometry or Physics?" Studies in History and Philosophy of Science, Vol. 4, No. 2, 1973, 165-72
  
  
• "Functions," The Philosophical Review, Vol. 82, No. 2, 1973, 139-68
  
  
• "Explanation and Teleology," Philosophy of Science, Vol. 39, 1972, 204-18
  
  
• "The Case against Teleological Reductionism," The British Journal for the Philosophy of Science, Vol. 19, 1968, 211-23