Jeffrey Lidz is Professor of Linguistics at the University of Maryland, having previously held positions at Northwestern University, the University of Pennsylvania, CNRS Paris, and the University of Delaware. His main research interests are in language acquisition, syntax, and psycholinguistics and his many publications include articles in Language Acquisition, Language Learning and Development, Language, Linguistic Inquiry, and Natural Language Semantics, as well as chapters in numerous edited volumes. William Snyder is Professor of Linguistics at the University of Connecticut. His current research topics include argument structure (datives, resultatives, particles, path phrases), A- and A-bar movement (passives, reflexive-clitic constructions, P-stranding, comparatives), compound words, and syllable structure. A past editor of the journal Language Acquisition: A Journal of Developmental Linguistics, Snyder is author of Child Language: The Parametric Approach (OUP 2007). Joe Pater is Professor of Linguistics at the University of Massachusetts. His work explores phonological theory and acquisition and has been published in journals including Phonology, Linguistic Inquiry, and Natural Language and Linguistic Theory. His current research focuses on the use of weighted constraints for the modelling of phonology and its learning.