The study of evidentiality is in its relative infancy, and each new study in this largely unexplored area of linguistic structure reveals subtleties of grammatical and semantic behavior that give reason to reconsider and deepen analyses found in previous works. Evidentiality is usually discussed in terms of the kinds of justification a speaker has for making a particular assertion. When the author first began studying the Wanka Quechua language, he was immediately struck with the fact that the evidential system was not behaving as he had expected. Careful consideration of the individual markers revealed semantic nuances that are not usually found in other treatments on this topic. This volume provides a detailed look at the semantics of the evidential system of one Quechua language with implications for others. Parallels are noted with evidential systems of unrelated languages. The author analyzes the Wanka Quechua evidential system using a cognitive view of grammar and applies this approach to issues of semantics and category structure.