Checking and the Argument from Inquiry

In his recent book, Knowing and Checking, Guido Melchior argues that, when we attempt to check whether p, we tend to think that we do not know p. Melchior then uses this assumption to explain a number of puzzles about knowledge. One outstanding question for Melchior's account, however, is why this tendency exists. After all, Melchior himself argues that checking is not necessary for knowing, so why would we think that we fail to know that p when we are in the midst of checking that p? I will explore one such suggestion for why this occurs, arguing that the connection between checking and inquiry can shed light on the impact that checking has on knowing.