Abstract
In this paper I will discuss the significance of upam na in the Ny yas tra as a source of knowledge and its role in understanding and learning about the world. Some philosophers, particularly Buddhists, have argued that upam na is reducible to inference. I am going to defend the Ny ya view that upam na is in fact a fundamental source of knowledge which plays a significant role in teaching and learning. In fact, I am going to argue that by introducing upam na as a pram a the Naiy yikas accounted for the way humans acquire certain types of knowledge. Finally, I will highlight the similarities between the role of upam na in the Ny yas tra and some of Wittgenstein's remarks on family resemblance and proof.