Pramana (Tib. tsema; tshad ma) is a Sanskrit term, the primary meaning and most common translation of which is 'valid cognition', meaning the correct knowledge of a particular object. A valid cognition can either be a direct perception or an inference.
As a consequence, the term is also used to refer to the corpus of Buddhist teachings on epistemology (the science of cognition, i.e. how do we know things) and ontology (which investigates the nature of existence), as these two are inextricably linked in Buddhism. The pioneers of these teachings are the Indian masters Dignaga and Dharmakirti. Pramana is taught in all shedras since it is the basis for debate, an important learning tool in traditional monastic universities. In this context the term is sometimes translated as 'Buddhist logic'.