Editorial; Yike Guo, R. Grossman. Parallel Formulations of Decision-Tree Classification Algorithms; A. Srivastava, Eui-Hong Han, V. Kumar, V. Singh. A Fast Parallel Clustering Algorithm for Large Spatial Databases; Xiaowei Xu, J. Jager, H.-P. Kiregel. Effect of Data Distribution in Parallel Mining of Associations; D.W. Cheung, Yongqiao Xiao. Parallel Learning of Belief Networks in Large and Difficult Domains; Y. Xiang, T. Chu.