Developing a Spell Checker as an Expert System

In this paper we discuss some basic concepts of knowledge engineering, expressing our feeling that there is something missing. In our opinion, the missing link, able to clarify all the basic concepts, should be the concept of energy, not in use in knowledge engineering practice and theory at all. Since energy is an extremely abstract concept, which let to misunderstanding even in phisics, we humbly introduce it by describing an existing expert system, called Hascheck. We also present here a mathematical model of Hascheck's learning. The model led to the so-called cognoelectrical analogy, which allowed some energy considerations about learning and knowledge.