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Environments

PRODIGY is not designed for real-world environments. The environments in which PRODIGY operates are its problem domains. A problem domain consists of a set objects and a set of operators. The only changes to the environment occur through the application of operators on objects.

Problem domains include:

Major charateristics shared by these environments are given below. 


Dynamic

Changes to the environment are due to the application of operators.
No simulatd outside forces alter the environment.



Predictable

The future state of the environment is at any moment depends on the
operator applied at that moment and any lasting effects of previous
operators. This knowledge is stored in the planner's search
tree.

 

Simulated

All environments are simulated. PRODIGY does not carry out plans in
the real world.



Consistency

The state of the environment is precisely determined by applied operators' 
addlists and deletelists. It is thus entirely consistant. The problem solver
may generate failed plans in a search tree, but the effects of addlists
and deletelists are certain.



Other