1. Introduction; Part I. Grammar: 2. Functional categories and language typology; 3. Lexical, morphological and phonological dimensions of functional categories; 4. Semantics and pragmatics; 5. Theoretical syntax: the generative tradition; Part II. Historical Linguistics: 6. Grammaticalisation; 7. Linguistic reconstruction; Part III. Psycholinguistics: 8. Speech production; 9. Language development; 10. Agrammatic aphasia and Specific Language Impairment; 11. Language attrition and death; Part IV. Language Contact and Bilingual Speech: 12. Sign languages; 13. Code-switching and code-mixing; 14. Lexical borrowing; 15. Pidgin and creole genesis; 16. Mixed languages; 17. Foreigner Talk; 18. Towards a modular and multi-dimensional perspective.