Commonsense Reasoning

For long time ago, researchers have been study the theoretical parts of how to represent commonsense knowledge. However, nobody has compared different opinions of what is in fact the commonsense knowledge. This research area is new and it needs our attention. The commonsense reasoning has been studied in different areas, such as philosophy, psychology, and computer science. As part of our research, we studies different views of what is commonsense knowledge and reasoning. At the end of this chapter, we suggest four important definitions for our research. We start with the notions of common sense as part of " folk psychology ". According to W ikipedia Online Dictionary, " folk psychology " (sometimes called naive psychology or common sense psychology) is the set of background assumptions, socially-conditioned prejudices and convictions that are implicit in our everyday descriptions of others' behavior and in our ascriptions of their mental states. We also discuss how some of the knowledge representation researchers in different Computer Science fields describe commonsense reasoning, as well as default reasoning and non-monotonic reasoning.