This volume contains papers presented at the secondinternational workshop on extensions of logic programming, which was held at the Swedish Institute of Computer Science, Stockhom, January 27-29, 1991.The 12 papers describe and discuss several approaches toextensions of logic programming languages such as PROLOG, aswell as connections between logic programming and functionalprogramming, theoretical foundations of extensions, applications, and programming methodologies.The first workshop in this series was held in T}bingen in1989 and its proceedings areavailable as LNCS 475. Thethird workshop...