Abstract
Concept representation is a key to natural language understanding. Several strategies have previously been proposed. But many of them have been confined to illustrations in text books rather than been actually implemented in large scale natural language systems. We propose a concept representation strategy that treats each "concept" as an object. Manipulating the relationships among the concepts are considered as operating on the corresponding objects. We find that this representation not only is convenient in consolidating our view on "concepts", but can be readily implemented using an object oriented language such as C++.