In this paper, we study the class of Baire one path systems as a metric space and as a multifunction and show that some known classes of path systems such as continuous path systems, composite continuous path systems, and first return path systems are subclasses of the class of Baire one path systems. In particular, we show that a path system is composite continuous if and only if it is Baire[Formula: see text] one path system. We also show that for a composite continuous path system [Formula: see text], the upper (respectively, lower) extreme path derivatives [Formula: see text] (respectively, [Formula: see text]) of a function [Formula: see text] are upper (respectively, lower) Baire two functions, and when [Formula: see text] is [Formula: see text]-differentiable, [Formula: see text].