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Evaluator-Critic Criticism Conflict

This is a conflict between the cup radius value evaluator from the volume point of view and its critic, as shown in figure 7.1. Since the evaluation of the value is a second level entity, the criticism of that evaluation is a third level entity. This is an interesting conflict because it involves this third level entity.

  
Figure 7.1: Criticism of an evaluation

Once there is a value for the cup radius, the preconditions of the evaluator are satisfied, so it provides the evaluation good from the volume point of view since the difference between the volume of the cup and the ideal value for volume, which is 20 cc. according to this evaluator, is less than 3 cc. This is the limit the volume can deviate from the ideal and still be considered to be good. The critic of the evaluation has a constraint which says that the evaluation should be numeric, not symbolic. As this constraint is violated, the critic produces a criticism and initiates a conflict. When the evaluator is asked for a more precise evaluation, it supplies an evaluation represented as a percentage of the optimal quality that can be achieved from its point of view. This percentage represents how close to the ideal volume the current volume is and is calculated using the formula where 20 is the ideal value for volume for this particular evaluator.

Here is the excerpt:

Cup Radius Value Volume Evaluator: Evaluation asserted. Cup
radius value is good from a volume pov.

Cup Radius Value Evaluation Precision Critic: Conflict detected
with Cup Radius Value Volume Evaluator.

Cup Radius Value Evaluation Precision Critic: Criticism asserted.
Cup radius value evaluation is too imprecise.

Cup Radius Value Evaluation Precision Critic: Ask Cup Radius
Value Volume Evaluator to offer a more precise evaluation.

Cup Radius Value Volume Evaluator: Changing to precision
evaluation mode.

Cup Radius Value Volume Evaluator: Evaluation asserted. Cup
radius value's quality is 88 percent.

Cup Radius Value Evaluation Precision Critic: Criticism
retracted.  Cup radius value evaluation is not imprecise anymore.

Cup Radius Value Evaluation Precision Critic: Conflict with Cup
Radius Value Volume Evaluator resolved.


Ilan Berker
Thu Apr 27 16:25:38 EDT 1995