8. The system of claim 7 , where a filter link with the narrow scope of relevance describes a filter clinical dictionary term that establishes that at least two clinical terms are synonymous.
7. A system, comprising: a base dictionary, stored on a computer readable storage medium, comprising clinical terms from a study linked to one another; a filter dictionary comprising filter clinical dictionary terms; a set of filter links mapping clinical terms to the filter clinical dictionary terms, a filter link having an associated scope of relevance describing a level of relevance between the linked filter dictionary term and clinical term, where at least one scope of relevance is a narrow scope of relevance and at least one scope of relevance is a broad scope of relevance, the filter links defining a level of medical relationships between a clinical term and at least one other clinical term taken from the at least one clinical terms that have no obvious linguistic relationship to each other; and a query processing unit configured to receive a clinical match term and one or more filter conditions, where the filter conditions are searchable based on a corresponding scope of relevance and to query a memory of data from study to return results that include the clinical match term as filtered by the filter conditions.