this book represents the refereed proceedings of the fourth international conference on monte carlo and quasi-monte carlo methods in scientific computing which was held at hong kong baptist university in 2000. an important feature are invited surveys of the state-of-the-art in key areas such as multidimensional numerical integration, low-discrepancy point sets, random number generation, and applications of monte carlo and quasi-monte carlo methods. these proceedings include also carefully selected contributed papers on all aspects of monte carlo and quasi-monte carlo methods. the reader will be informed about current research in this very active field.