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Subject: Diagramming trust - another take


>

After another long talk with Dave Ellis, I am again inspired to try to  
express some ideas, and this time I come with definitions and diagrams.

Goal: a desired set of real world effects

Goal may be that the real world effects are realized, avoided, or some  
combination.

Constraint: a specified set of real world effects that an actor is
   (1) limited from pursuing or being responsible for indirectly  
causing, or
   (2) responsible for pursuing

Ownership Boundary: the extent of an identifiable set of actors  
sharing a common set of goals and constraints, and other common  
entities through which the goals and constraints can be expressed.

A given actor may reside within one or more ownership boundaries.   
There may be agreed upon protocols for interactions that cross  
ownership boundaries or an actor crossing an ownership boundary may  
independently need to resolve any mismatches.

Reputation: a property of a given actor assigned by other actors based  
on the accumulated experience experience of the other actors on the  
extent to which real world effects resulting from interaction with the  
given actor are assessed as desirable, neutral, or undesirable.

Other definitions are needed but I was concentrating on the diagrams  
that follow.

JPEG image



An Actor has goals and constraints based on the Ownership Boundary in  
which it resides.  This Actor can be influenced or constrained by  
other actors who have their own goals and constraints, where the  
actors providing influence or constraints may be peers, subordinates,  
or superiors.  The influencing actor is often a superior.

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A later diagram also includes evidence, and these will need to be  
merged or made consistent.

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Note when there is no direct interaction, the Trusted Actor knows  
nothing of the Trusting Actor and acts strictly in concert with its  
goals. The Trusting Actor has an interest in some possibly resulting  
real world effects but no interaction with the Trusted Actor.

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The following sequence diagrams are rough but demonstrate how the  
relationships should in the class diagrams are realized.

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message 6 should have been deleted

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-----------------------------------------------------------------------------
Ken Laskey
MITRE Corporation, M/S H305      phone: 703-983-7934
7515 Colshire Drive                         fax:       703-983-1379
McLean VA 22102-7508







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