In this stage, the main goal is to mark out the concept and give the detail definition for each concept which has been identified in Step2.I.I, the definition is derived for or refer to the concept existed in Word N et. There are two kinds of deficiencies. Firstly, Word Net is not formal; secondly, it does not support reasoning rules while this is important in terms of Ontology. However, WordNet provide a valuable resource for domain important terms and the relationships between terms, so while the detail definition of concept we needed is in the WordNet, we just import it