This volume contains the refereed technical papers presented at ES99, the Nineteenth SGES International Conference on Knowledge-Based Systems and Applied Artificial Intelligence, held in Cambridge in December 1999.

Technical Keynote Address.- Can We Make Information Extraction More Adaptive?.- Best Refereed Technical Paper.- The KRAFT Architecture for Knowledge Fusion and Transformation.- Session 1: Learning.- Sequencing Training Examples for Iterative Knowledge Refinement.- Multistrategy Relational Learning of Heuristics for Problem Solving.- Learning Perceptual Schemas to Avoid the Utility Problem.- Extracting Constraint Knowledge from Code: A Case-Based Reasoning Approach.- Session 2: Knowledge Discovery.- Automatic Induction of Classification Rules from Examples Using N-Prism.- Learning Lazy Rules to Improve the Performance of Classifiers.- Algorithms for Computing Association Rules Using a Partial-Support Tree.- Discovering Surprising Patterns by Detecting Occurrences of Simpson’s Paradox.- Session 3: Case-Based Beasoning.- Automating Case Selection in the Construction of a Case Library.- Improving a Distributed Case-Based Reasoning System Using Introspective Learning.- Structured Cases in CBR — Re-using and Adapting Cases for Time-Tabling Problems.- Roget’s Thesaurus: An Additional Knowledge Source for Textual CBR?.- Session 4: Knowledge Engineering.- Knowledge Management Through Multi-Perspective Modelling: Representing and Distributing Organisational Memory.- Ontology Assisted Process Knowledge Acquisition.- Web-Mediated Knowledge Servers: Some Technical Issues.- CAPE: Extending CLIPS for the Internet.- Session 5: Knowledge Representation and Refinement.- Approach to Active Knowledge Based Scene Exploration.- Object Location in Colour Images Using Fuzzy-Tuned Scanpaths and a Neural Network.- An Algebraic Approach to KBS. Application to Computer Network Selection.- Qualitative Reasoning with Complex and Composite Regions in 2D Space.- Author Index.