Difference between Model and Utility.

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Model	Utility
1] Maintain internal state to track aspects of the world that are not evident in the current precept.	It try to maximize their own expected happiness.
2] The knowledge about “how the world works” – whether implemented in Boolean ckt or in complete scientific theories – is called a model of the world. An agent uses such model .	It uses a model of the world, along with a utility function, that measures its preferences among states of the world.
3] UPDATE – STATE function which is responsible for creating the new internal state description.	Utility function maps a state onto a real number which describes the associated degree of happiness.
4] It handle the partial observability environmental effectively.	It must handle the uncertainty inherent in partially observable environment.

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