Control Structures Are Patterns of Passing Messages
Hewitt reported: "... we have found that we can do without the paraphernalia of "hairy control structure" (such as possibility lists, non-local gotos, and assignments of values to the internal variables of other procedures in CONNIVER.)... The conventions of ordinary message-passing seem to provide a better structured, more intuitive foundation for constructing the communication systems needed for expert problem-solving modules to cooperate effectively."
The Actor model provided the foundation for solving the Artificial Intelligence control structure problem. It took considerable time to develop programming methodologies for the Actor model. Indeed, the implementation of the scientific community metaphor requires sophisticated message passing that is still the subject of research.
Read more about this topic: Planner (programming Language)
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