1. “Do not trust people - they are capable of greatness” Stanislaw Lem Trust Models Steve Marsh Carleton University, November 2nd 2009 steve.marsh@crc.gc.ca © stephen marsh, 2009

2. Outline Why What How

3. Why…

4. Trust as Syllogism

5. Yes, but why in agents?

6. Societies and decisions

7. What… … is it?

8. No wait! What… … isn’t it?

9. What… … is it?

10. Trust is complexity reduction

11. Trust is history

12. Trust is reasoning

13. Trust is observability

14. Trust is not control

15. Trust is risk in action

16. Trust is seen in action Or the air Like light

17. Don’t just talk about it, do it… And see it…

18. Caveat…

19. What… On Trust Models Types Functions Representations

20. Models of Trust

21. Cognitive

22. Game-Theoretical

23. Hybrid (possibly)

24. Modes (so, what’s it for? How’s it work?)

25. Establishment

26. Establishment Reasoning

27. Establishment Reasoning Action

28. Representations

29. Fuzzy Terms Logic Real Numbers Integers Vectors

30. How… Two ‘real life’ models

31. Marsh; 1994, 2009 Castelfranchi (et al); (various), 2009 (there are lots more…)

32. Types of Trust The Marsh Model

33. Types of Trust 1: Basic The Marsh Model

34. Types of Trust 2: General The Marsh Model

35. Types of Trust 3: Situational The Marsh Model

36. How much do I have? The Marsh Model

37. How much do I need? The Marsh Model

38. Do I ‘Trust’ Thee? The Marsh Model

40. Distrust, Mistrust, Untrust, Ambivalence Oh My! The Marsh Model

41. Regret The Marsh Model

42. Regret Adapts Trust (with Understanding) The Marsh Model

43. Anticipatory Regret The Marsh Model

44. Forgiveness Repairs Trust The Marsh Model

45. Forgiveness Function (There are limits to Forgiveness) The Marsh Model

46. Continuum 10 DistrustTrust Untrust C_T Limit of Forgivability The Marsh Model

47. A Logical Model The Castelfranchi et al. Model

48. Core Trust and (Generalized) core trust The Castelfranchi et al. Model

49. Distrust and (Generalized) distrust The Castelfranchi et al. Model

50. Mistrust and (Generalized) mistrust The Castelfranchi et al. Model

51. Delegation (reliance) The Castelfranchi et al. Model

52. Decision to trust The Castelfranchi et al. Model

53. Comparative Trust The Castelfranchi et al. Model

55. Expressiveness and non-reductionism vs Implementability

56. Where does it all fit?

57. Where to look for information Start here… And here… Try a google search…

58. “Never trust a man who, when left alone in a room with a tea cosy, doesn’t try it on” Billy Connelly