Parameter-Free Induction, the Matiyasevič Theorem and B&Sgr;1 (Z. Adamowicz). A Laver-Type Indestructibility for Accessible Cardinals (S. Ben David). A Complete Inference System for Regular Processes with Silent Moves (J.A. Bergstra and J.W. Klop). Cumulative Logic Programs and Modelling (E. Engeler). What is Negation in a System? (D.M. Gabbay). Teaching Logic by Computer: A Hacker's Guide (P. Gibbins). On the Role of 0' in Recursion Theory (A. Kučera). The Origins of Forcing (G.H. Moore). How to Obtain Interpolation for L&kgr;+&kgr; (J. Oikkonen). The Craig Interpolation Lemma for Certain Modal Logics (J. Plaza). Model Theory and Representation Type of Algebras (M. Prest). The Knuth-Bendix Completion Procedure, the Growth Function, and Polycyclic Groups (M.M. Richter). Introduction to the Theory of Logic Programming (J.C. Shepherdson). A Complete Class of Restricted Logic Programs (O. Štěpánková and P. Štěpánek). Oscillations of Real Numbers (S. Todorcevic). Doing without Determinacy-Aspects of Inner Models (P.D. Welch).