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Difference between Backward chaining and forward chaining

·        Forward Chaining: It provides the automatic calculations of the property value by executing the declarative rule, when any one of the input property value is changed.
EX: If the Area property depends on the Length and Width property, then forward chaining causes the Area property recomputed each time either
Length/Width value changes.
·        Backward Chaining: It provides the automatic calculations of a property value by executing the declarative rule, when a value is needed for property rather than whenever inputs change.
  
EX: If the Area property depends on the Length and Width property, then backward chaining causes the Area property recomputed each time the Area property is required.

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