Book excerpt: This volume contains the proceedings of the seventh Italian Workshop on Neural Nets WIRN VIETRI '95, organized by the International Institute for Advanced Scientific Studies 'E R Caianiello' (IIASS) and Società Italiana Reti Neuroniche (SIREN).The spectrum of contributors and participants covers the activity of Italian research in the field. The papers of the two invited speakers, M J Jordan ('Sigmoid Belief Networks') and E Oja ('Principal and Independent Component Analysis'), and the two reviews ('Fast Learning Algorithms for Feedforward NN' and 'ANN Ensembles: a Bayesian Standpoint') complete the highly qualified contents of the volume.