This collection of papers provides an overview of previous studies on the acquisition of Spanish as a second or foreign language, theoretical approaches used in these studies, and effects of various pedagogical approaches on the development of Spanish interlanguage systems. The 10 chapters include the following: (1) "Phonology: Staking Out the Territory at the Turn of the Century: Integrating Phonological Theory, Research, and the Effect of Formal Instruction on Pronunciation in the Acquisition of Spanish as a Second Language" (A. Raymond Elliott); (2) "Tense/Aspect: The Development of Tense/Aspect Morphology in Spanish as a Second Language" (Silvina Montrul and Rafael Salaberry); (3) "Subjunctive/Syntax: The Development of Subjunctive and Complex-Syntactic Abilities among Foreign Language Learners of Spanish" (Joseph G. Collentine); (4) "Clitics: Cognitive and Linguistic Perspectives on the Acquisition of Object Pronouns in Spanish as a Second Language" (James F. Lee); (5) "Lexicon: The Acquisition of Lexical Meaning by Second Language Learners: An Analysis of General Research Trends with Evidence from Spanish" (Barbara A. Lafford, Joseph G. Collentine, and Adam S. Karp); (6) "Pragmatics/Discourse: Pragmatics and Discourse Analysis in Spanish Second Language Acquisition Research and Pedagogy" (Dale A. Koike, Lynn Pearson, and Caryn Witten); (7) "General Perspectives: Current Issues in the Generative Study of Spanish Second Language Syntax" (Liliana Sanchez and Almeida Jacqueline Toribio); (8) "Cognitive Perspectives: Cognitive Perspectives on the Acquisition of Spanish as a Second Language" (Paola E. Dussias); (9) "Sociocultural Perspectives: Sociocultural Theory and the Acquisition of Spanish as a Second Language" (Marta Anton, Frederick J. Dicamilla, and James P. Lantolf); and (10) "Instruction: The Role of Instruction in Spanish Second Language Acquisition" (Charles Grove). (Papers contain references.) (SM)