This work investigates into the semantic domain of evidentiality and its grammatical expression in Spanish. A model for describing the evidentiality domain is outlined, which emphasises the scalar nature of the proposed parameters: information source (subject-internal ↔ external), access to information (exclusive ↔ universal) and mode of access (sensory ↔ cognitive), all of which are construed as bipolar continua. Support is also provided for the relevance of using the notions of deixis and perspective in describing evidentiality. The prevailing view in current research is that of evidentiality being a grammatical category to be analysed separately from other evidential strategies. The present study challenges this view as it attempts to broaden the perspective on how evidential meanings, expressed by various grammatical means, fit into an overall picture of human cognition and communication patterns. The theoretical framework adopted is that of Cognitive Grammar, which, it is argued, is particularly suited for investigating evidentiality, in particular due to the central role given to perspective, metaphor and category fuzziness in describing grammar and grammatical structures. Four articles constitute the body of this work, in which four different prototypical aspects of the encoding of evidentiality into grammatical devices in Spanish are addressed. In the first, the marking of common knowledge in consecutive connectives is argued to depend on a perspective shift; the second proposes the evidential values of tense morphemes to be their core meaning, time deixis being an inference; in the third and the forth it is claimed that the evidential and modal effects of both subject-raising and clitic climbing are determined through the attribution of varying degrees of prominence to the relational participants.