ThePaci?c-AsiaConferenceonKnowledgeDiscoveryandDataMining(PAKDD) has been held every year since 1997. This year, the eighth in the series (PAKDD 2004) was held at Carlton Crest Hotel, Sydney, Australia, 2628 May 2004. PAKDD is a leading international conference in the area of data mining. It p- vides an international forum for researchers and industry practitioners to share their new ideas, original research results and practical development experiences from all KDD-related areas including data mining, data warehousing, machine learning, databases, statistics, knowledge acquisition and automatic scienti?c discovery, data visualization, causal induction, and knowledge-based systems. The selection process this year was extremely competitive. We received 238 researchpapersfrom23countries,whichisthehighestinthehistoryofPAKDD, and re?ects the recognition of and interest in this conference. Each submitted research paper was reviewed by three members of the program committee. F- lowing this independent review, there were discussions among the reviewers, and when necessary, additional reviews from other experts were requested. A total of 50 papers were selected as full papers (21%), and another 31 were selected as short papers (13%), yielding a combined acceptance rate of approximately 34%. The conference accommodated both research papers presenting original - vestigation results and industrial papers reporting real data mining applications andsystemdevelopmentexperience.Theconferencealsoincludedthreetutorials on key technologies of knowledge discovery and data mining, and one workshop focusing on speci?c new challenges and emerging issues of knowledge discovery anddatamining.ThePAKDD2004programwasfurtherenhancedwithkeynote speeches by two outstanding researchers inthe area of knowledge discovery and data mining: Philip Yu, Manager of Software Tools and Techniques, IBM T.J.

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Invited Speeches.- Session 1A: Classification (I).- Session 1B: Clustering (I).- Session 1C: Association Rules (I).- Session 2A: Novel Algorithms (I).- Session 2B: Association (II).- Session 2C: Classification (II).- Session 3A: Event Mining, Anomaly Detection, and Intrusion Detection.- Session 3B: Ensemble Learning.- Session 3C: Bayesian Network and Graph Mining.- Session 3D: Text Mining (I).- Session 4A: Clustering (II).- Session 4B: Association (III).- Session 4C: Novel Algorithms (II).- Session 4D: Multimedia Mining.- Session 5A: Text Mining and Web Mining (II).- Session 5B: Statistical Methods, Sequential Data Mining, and Time Series Mining.- Session 5C: Novel Algorithms (III).- Session 5D: Biomedical Mining.