Acknowledments. Introduction. The Acquisition of Word Meaning And Lexicon: Referential Avoidance and Parental Intervention. The Acquisition of Syllabic and Word Structure: Individual Differences and Universal Constraints. Variation In The Acquisition of Syllabic and Word Structure: Language-Dependent Constraints. The Re-Emergence of Spanish and Hebrew In Early Adolescence. The Re-Acquisition of Spanish, Hebrew and Portuguese In Late Adolescence. Summary, Conclusions, and Future Research. Appendix.