© 1997

Logical Tools for Modelling Legal Argument

A Study of Defeasible Reasoning in Law


Part of the Law and Philosophy Library book series (LAPS, volume 32)

Table of contents

  1. Front Matter
    Pages i-xiii
  2. Henry Prakken
    Pages 1-14
  3. Henry Prakken
    Pages 15-31
  4. Henry Prakken
    Pages 33-65
  5. Henry Prakken
    Pages 67-100
  6. Henry Prakken
    Pages 101-139
  7. Henry Prakken
    Pages 141-178
  8. Henry Prakken
    Pages 179-201
  9. Henry Prakken
    Pages 203-218
  10. Henry Prakken
    Pages 219-247
  11. Henry Prakken
    Pages 249-274
  12. Henry Prakken
    Pages 275-285
  13. Back Matter
    Pages 287-314

About this book


This book is a revised and extended version of my PhD Thesis 'Logical Tools for Modelling Legal Argument', which I defended on 14 January 1993 at the Free University Amsterdam. The first five chapters of the thesis have remained almost completely unchanged but the other chapters have undergone considerable revision and expansion. Most importantly, I have replaced the formal argument-based system of the old Chapters 6, 7 and 8 with a revised and extended system, whieh I have developed during the last three years in collaboration with Giovanni Sartor. Apart from some technical improvements, the main additions to the old system are the enriehment of its language with a nonprovability operator, and the ability to formalise reasoning about preference criteria. Moreover, the new system has a very intuitive dialectieal form, as opposed to the rather unintuitive fixed-point appearance of the old system. Another important revision is the split of the old Chapter 9 into two new chapters. The old Section 9. 1 on related research has been updated and expanded into a whole chapter, while the rest of the old chapter is now in revised form in Chapter 10. This chapter also contains two new contributions, a detailed discussion of Gordon's Pleadings Game, and a general description of a multi-Iayered overall view on the structure of argu­ mentation, comprising a logieal, dialectical, procedural and strategie layer. Finally, in the revised conclusion I have paid more attention to the relevance of my investigations for legal philosophy and argumentation theory.


Argumentation Theory Legal argumentation artificial intelligence intelligence logic logical analysis logical reasoning nonmonotonic reasoning

Authors and affiliations

  1. 1.Department of Computer ScienceFree University of AmsterdamThe Netherlands

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