This book presents papers read at the Conference on Legal Theory and Philosophy of Science, held at Lund, December 11-14,1983. The main idea of the conference was to arti- culate, to test, and to apply scientific rationality with regard to the domain of law and legal reasoning. Although. very different views were presented, the general impres- sion is that this idea may have some future, as it yielded many surprising and stimulating discussions in Lund. The editors express their gratitude to Torsten S5der- bergs och Ragnar S5derbergs Stiftelser, Marianne och Marcus Wallenbergs Stiftelse, Craffoordska Stiftelsen, Swensonska Fonden, Einar Hansens Forskningsfond, Svenska Institutet and Lunds Universitet for subsidizing the con- ference. We also express gratitude to Lund University for help of various kinds, including free rooms, assistance with copying materials, and thousands of other necessary things. We thank all people whose work made the conference possible, first of all Mr.Roland Sch5tt who during a long period acted as the secretary of the Organizing Committee, Mr.Mats Mattsson and Mrs.Irena Peczenik who helped with so many things necessary for the meetings, and many students and members of the staff of Lund University Law School.