IDEAL 98 contains over 50 original contributions presenting some of the most recent development in data engineering: data processing, data analysis, and knowledge acquisition, with a particular focus on Financial Engineering and Data Mining. More specifically, these proceedings examine the following aspects of this emerging field, including: Under "Financial Engineering" - Stock and Portfolio Management; Genetic Algorithms for Computational Finance; Exchange Rate Prediction; Financial Applications. Under "Data Mining" - Probabilistic Learning; Clustering and Classification; Rule Extraction; Evolutionary Computing in Data Mining; Data Mining Applications. This volume is ideal for researchers, scientists, engineers, as well as other professionals who are interested in intelligent data engineering.