Advantages of object-oriented approach over structured approach of problem solving?

The object-oriented approach has the following advantages: when the expert system is large, complexity is reduced through modularization, that is, by subdividing the system into manageable size components, such as objects, and establishing well-defined relationships between them. The internal design of each object is localised so that it does not depend on the internal design of another component. The design concepts are separated from the implementation details.

That means that rules are developed separately from the objects that they manipulate. Objects can be reused. They are written and debugged once, and then matched to form new applications.

The advantage of separation of the various components is that each of these is autonomous. What should be well-managed are the relationships between them. Unlike the other systems that implement a rule-based system as a library in object-oriented language, this architecture extends this further by applying object technologies

to every single component of the expert system, including the rule base.