This volume represents contributions to the 4th workshop "Computers in Chemistry" held in Hochfilzen, Tyrol in November 1989. The main objective of this workshop was to bring together scientists from the various disciplines of chemistry who were actively engaged in developing software or using the computer for the solution of chemical problems. The papers presented here are the result of discussions by experts active in fields like molecular modelling, chemometrics, synthesis planning, factual databases, data acquisition, interpretation and retrieval in spectroscopy and computer science.