Introduction: The problem of interdisciplinary discourse -- Part I. Definitions of interdisciplinarity: 1. The evolution of interdisciplinarity -- 2. The interdisciplinary archipelago -- 3. An interdisciplinary lexicon. -- Part II. Disciplinarity/interdisciplinarity: 4. The rhetoric of interdisciplinarity -- 5. Borrowing -- 6. The critique of limitation -- 7. The disciplinary paradox. -- Part III. The state of the art: 8. IDR: problem-focused research -- 9. Interdisciplinary care -- 10. IDS: interdisciplinary education -- Conclusion: The integrative core