I-VI -- Preface -- Contents -- Part I. Scope, theories and methods -- 1. Introduction -- 2. Purpose and general design of project -- 3. Interactants and recordings -- 4. The application of Interaction Process Analysis (IPA) -- 5. The application of linguistic tentativeness signals -- Part II. Hypotheses and results -- 6. Delimitation hypotheses -- 7. Particular hypotheses -- Part III. Presentation of results by stratificational category -- 8. Results shared in by all substrata (TOT) -- 9. The younger generation (YNG) -- 10. The older generation (OLD) -- 11. The managerial workers (ΜΑΝΑ) -- 12. The clerical workers (CLER) -- 13. The manual workers (MANU) -- 14. The younger managerial workers (YMA) -- 15. The older managerial workers (OMA) -- 16. The younger clerical workers (YCL) -- 17. The older clerical workers (OCL) -- 18. The younger manual workers (YMU) -- 19. The older manual workers (OMU) -- 20. Conclusion -- Bibliography -- Author index -- Systematic index of particular hypotheses -- Alphabetical index of particular hypotheses -- General index