This chapter examines some key developments in discussions of the social dimensions of knowing-how, focusing on work on the social function of the concept of knowing-how, testimony, demonstrating one's knowledge to other people, and epistemic injustice. I show how a conception of knowing-how as a form of 'downstream knowledge' can help to unify various phenomena discussed within this literature, and I also consider how these ideas might connect with issues concerning wisdom, moral knowledge, and moral testimony.

Can understanding be transmitted by testimony, in the same sense that propositional knowledge can be transmitted by testimony? Some contemporary philosophers – call them testimonial understanding pessimists – say No, and others – call them testimonial understanding optimists – say Yes. In this chapter I will articulate testimonial understanding pessimism (§1) and consider some arguments for it (§2).