Abstract
This chapter provides an overview of representation of commonsense knowledge. Commonsense knowledge is knowledge about the world that everybody knows. This chapter explains how the performance of a representation for commonsense knowledge can survive the unpleasant computational environment of the real world. Commonsense knowledge is knowledge about the structure of the external world that is acquired and applied without concentrated effort by any normal human that allows him or her to meet the everyday demands of the physical, spatial, temporal, and social environment with a reasonable degree of success. Commonsense knowledge is useful exactly because it is a description of the environment that is maintained at very low cost. The fact that commonsense knowledge is reasonably useful under real-world performance constraints without concentrated effort suggests an opportunistic way of operating.
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