Ralph: Utility-driven

Description

• RALPH's reasoning is guided by the Maximum Expected Utility (MEU) principle. This principle can be summarized as "Do the Right Thing".
• Each execution architecture produces its own plan according to its own knowledge types . In particular, the Action-Utility and the Decision-Theoretic architectures utilize an MEU function to evaluate the best actions given knowledge of current and future states.
• The meta-level arbitrator evaluates the expected utility of action, planning and replanning .
• The architecture that is chosen by the meta-level arbitrator to provide the plan for a designated task in the current state can create the highest quality plan (i.e. with the most desirable long-term effects) within the evaluated time constraints.