Current Issues in Computational Linguistics: In Honour of Don Walker

With this volume in honour of Don Walker, Linguistica Computazionale con­ tinues the series of special issues dedicated to outstanding personalities who have made a significant contribution to the progress of our discipline and maintained a special collaborative relationship with our Institute in Pisa. I take the liberty of quoting in this preface some of the initiatives Pisa and Don Walker have jointly promoted and developed during our collaboration, because I think that they might serve to il