Abstract
Which factors are relevant for the assessment of the exercise of our capacities to reason and argue? And what do these factors reveal about the nature of these capacities? The aim of this paper is to address these questions. In order to do this, we will try to explain, without presupposing the unviable use of sophisticated conceptual capacities, how a person can aim to identify correct reasons or arguments and properly satisfy such purpose. The contribution of our proposal resides in the linkage between certain conceptions of the implicit knowledge, the notion of proper function, and some of the results in the experimental research on metacognition, with the aim of gaining a better understanding of the exercise of our capacities to reason and argue.