In any field, experience is required for a proficient person to become an expert  Through experience, a proficient person gradually develops a repertory of model situations that allows an immediate, intuitive response to each new situation  This is the hallmark of expertise, and for this reason computerized expert systems cannot be as good as human experts
Although computers have the ability to store millions of bits of information, the knowledge of human experts, who benefit from the experience of thousands of situations, is not stored within their brains in the form of rules and facts
The knowledge of human experts cannot be adequately rendered into the type of information that a computer can store.