As is set forth in the Section I, it is necessary not just to define the research in linguist or technical terms, but also to demonstrate clearly the relationship between the voice, technique, and repertoire. Through close analysis of the relevant repertoire a distinct set of demands required for the tenors emerges. The type of demand, whether it be range, high-notes, tessitura, floridity or any other, demonstrates the particularities of the voice for whom the repertoire was written. When sufficient data is collected, it represents a distinctive set of skills of a particular singer. This information can then be used to compare how singers were treated by different composers, what similarities exist, and how those similarities form groups of skills exploited differently by composers. Subsequently, by examining repertoire that was shared between singers the set of skills held in common can help to further refine the understanding of particular dissimilarities.