'[The authors'] challenging and fruitful questioning and their innovation in methodologies will be much more valuable for the future of the field than most of the empty theoretical fabrications that are so common in developmental psycholinguistics.' Child Development Abstracts and Bibliography

• Preface; Acknowledgements; Part I. Background: 1. Introduction; 2. Modules and mechanisms; 3. Individual differences and the correlational method; 4. Review of the individual differences literature; Part II. Individual Studies; Section 1. Overall Design of Longitudinal Study: 5. Study 1: comprehension and production at 10 and 13 months; 6. Study 2: the meaning of mean length of utterance at 20 months; 7. Study 3: lexical development and lexical style at 20 months; 8. Study 4. single- and multiword comprehension at 20 months; 9. Study 5: acquisition of a novel concept at 20 months; 10. Study 6: the meaning of mean length of utterance at 28 months; 11. Study 7. lexical development and lexical style at 28 months; 12. Study 8: morphological productivity at 28 months; 13. Study 9: lexical comprehension and the question of intelligence; 14. Study 10: grammatical comprehension at 28 months; Part III. A Summary View: 15. Study 11: a factor analytic approach; 16. Study 12: social contributions to individual differences; 17. Conclusion; References; Index; Subject Index.