For questions related to expert systems, which are computer systems that emulate the decision-making ability of a human expert. Expert systems are designed to solve complex problems by reasoning through bodies of knowledge, represented mainly as if-then rules. The first expert systems were created in the 1970s and then proliferated in the 1980s. Expert systems were among the first truly successful forms of artificial intelligence software (symbolic AI).
For more info, see https://en.wikipedia.org/wiki/Expert_system.
