CHAPTER Fact models 6 This chapter describes · why a fact model should be built to support rule statement writing and other aspects of system specification; · what a fact model consists of, and how it differs from other models and forms of documentation; · how nouns, possibly qualified by adjectives, or (occasionally) other words, can be can be selected as business terms, defined and given an appropriate place in the taxonomy of business terms; and · how fact types can be used to relate business terms (along with verbs and possibly prepositions). 6.1 FACT MODELS: AN OVERVIEW