Perfect fundamental logic - artificial intelligence:

However, while it's theoretically  possible to do definite intelligent things (like prove some easy mathematics theorems and algorithms) with programs totally based on data and logic, such kind of methods are held back by the very widest search places involved. People began to think about heuristics--  rules of thumb  -  which they could use to enable their programs to get jobs done in a reasonable time. They solve the quarry like this:

We're not sure that humans reason are perfect fundamental logic all the time with a desired reason, but we are certainly intelligent. So, let's use introspection about this matter and tell our "AI" programs how to think like us. 

To solve this quarry, "AI" researchers started building expert systems, which encapsulated factual, procedural, organizations of human beings and heuristic knowledge about particular domains