A collection of essays on first and second language proficiency from the fields of psychology and linguistics includes the following: "Modeling and Assessing Language Proficiency" (John H. A. L. de Jong, Ludo Verhoeven); "The Construct of Grammar in Early Language Development" (Folkert Kuiken); "Dimensions in Grammatical Proficiency" (Wim H. J. van Bon); "Monitoring Reading and Spelling Achievement" (Martin J. C. Mommers, Johan H. L. Oud); "Speech Activity Theory and Reading Comprehension Assessment" (Eduard Bol, Giel Gresnigt, Mariette J. de Haan); "Assessment of Reading Disabilities" (Aryan van der Leij, Harry Smeets); "Information Analysis in Written Discourse" (Carel van Wijk); "Large Scale Writing Assessment" (Henk Blok, Kees de Glopper); "Differential Item Functioning" (Frank Kok); "Assessment of Bilingual Proficiency" (Verhoeven); "Self-Assessment of Minority Language Proficiency" (Kees de Bot); "Exploring the Second Language Learner Lexicon" (Anne Vermeer); "Modeling Communicative Second Language Competence" (Verhoeven, Vermeer); "Modeling and Assessing Foreign Language Loss" (Erik Schils, Bert Weltens); and "Dimensions in Oral Foreign Language Proficiency" (de Jong, Lieneke W. van Ginkel). (MSE)