The present volume presents new theoretical and empirical findings on the acquisition and development of clitics in and across different languages. It features ten chapters that largely emerged from the CYCL1A Workshop on the Acquisition of Clitics held in Nicosia, Cyprus, in May 2012. These chapters explore issues pertaining to the first (L1) and second language (L2) acquisition of clitic pronouns. There is an emphasis on Greek, with the first four chapters discussing mono- and bilingual acquisition of clitics in Cypriot Greek and the next two chapters on Standard Modern Greek. Three contributions focus on Albanian, Serbo-Croatian, and European Portuguese, respectively. The last chapter of this volume is an invited contribution by Ken Wexler on the Unique Checking Constraint as an explanation of clitic omission in normal and SLI development. This volume will constitute a valuable reference guide for current work on the acquisition of clitic pronouns.