The term "Pramana" is commonly found in various schools of Hinduism. In Buddhist literature, "Pramana" is referred to as "Pramāṇavāda". "Pramana" is also related to the Indian concept of "Yukti" (युक्ति) which means active application of epistemology or what one already knows, innovation, clever expedients or connections, methodological or reasoning trick, joining together, application of contrivance, means, method, novelty or device to more efficiently achieve a purpose. "Yukti" and "Pramana" are discussed together in some Indian texts, with "Yukti" described as active process of gaining knowledge in contrast to passive process of gaining knowledge through observation/perception. The texts on "Pramana", particularly by Samkhya, Yoga, Mimamsa and Advaita Vedanta schools of Hinduism, include in their meaning and scope "Theories of Errors", that is why human beings make error and reach incorrect knowledge, how can one know if one is wrong, and if so, how can one discover whether one's epistemic method was flawed, or one's conclusion (truth) was flawed, in order to revise oneself and reach correct knowledge.