1. A method for use in establishing a searchable data structure, comprising the steps of: providing a list of terms pertaining to a subject matter area of interest; and establishing a classification structure for said subject matter area of interest, said classification structure having a hierarchical form including classes, corresponding to a subset of said subject matter area, each of which includes one or more sub-classes corresponding to a subset of a respective one of said classes; for each one term of said terms, associating said one term with said classification structure such that said one term is assigned to at least one of said sub-classes and at least one of said classes.