This book contains refereed papers which were presented at the Second International Dortmund Meeting on Approximation Theory (IDoMAT a ~98) at Haus Bommerholz, the conference center of Dortmund University, during the week of February 23a "27, 1998. At this conference 50 researchers and specialists from Bulgaria, China, France, Great Britain, Hungary, Israel, Italy, Romania, South Africa and Germany participated and described new developments in the fields of univariate and multivariate approximation theory. The papers cover topics such as radial basis functions, bivariate spline...