“Do not trust people - they are capable of greatness” Stanislaw Lem Trust Models Steve Marsh Carleton University, November 2nd 2009 © stephen marsh, 2009
Outline Why What How
Why…
Trust as Syllogism
Yes, but why in agents?
Societies and decisions
What… … is it?
No wait! What… … isn’t it?
What… … is it?
Trust is complexity reduction
Trust is history
Trust is reasoning
Trust is observability
Trust is not control
Trust is risk in action
Trust is seen in action Or the air Like light
Don’t just talk about it, do it… And see it…
Caveat…
What… On Trust Models Types Functions Representations
Models of Trust
Cognitive
Game-Theoretical
Hybrid (possibly)
Modes (so, what’s it for? How’s it work?)
Establishment
Establishment Reasoning
Establishment Reasoning Action
Representations
Fuzzy Terms Logic Real Numbers Integers Vectors
How… Two ‘real life’ models
Marsh; 1994, 2009 Castelfranchi (et al); (various), 2009 (there are lots more…)
Types of Trust The Marsh Model
Types of Trust 1: Basic The Marsh Model
Types of Trust 2: General The Marsh Model
Types of Trust 3: Situational The Marsh Model
How much do I have? The Marsh Model
How much do I need? The Marsh Model
Do I ‘Trust’ Thee? The Marsh Model
Distrust, Mistrust, Untrust, Ambivalence Oh My! The Marsh Model
Regret The Marsh Model
Regret Adapts Trust (with Understanding) The Marsh Model
Anticipatory Regret The Marsh Model
Forgiveness Repairs Trust The Marsh Model
Forgiveness Function (There are limits to Forgiveness) The Marsh Model
Continuum 10 DistrustTrust Untrust C_T Limit of Forgivability The Marsh Model
A Logical Model The Castelfranchi et al. Model
Core Trust and (Generalized) core trust The Castelfranchi et al. Model
Distrust and (Generalized) distrust The Castelfranchi et al. Model
Mistrust and (Generalized) mistrust The Castelfranchi et al. Model
Delegation (reliance) The Castelfranchi et al. Model
Decision to trust The Castelfranchi et al. Model
Comparative Trust The Castelfranchi et al. Model
Expressiveness and non-reductionism vs Implementability
Where does it all fit?
Where to look for information Start here… And here… Try a google search…
“Never trust a man who, when left alone in a room with a tea cosy, doesn’t try it on” Billy Connelly