 While there is some work on the question of the natural kindhood of episodic memory, the question of the natural kindhood of kinds of memory other than episodic memory remains almost entirely unexplored. Future work here might both draw on and contribute to resolving the debate between systems and process views of memory (Bechtel 2001; Foster &amp; Jelicic 1999; Schacter &amp; Tulving 1994). According to systems views, memory consists of multiple independent systems which interact in various ways. According to process views, in contrast, memory is a unitary capacity which is employed in different ways in response to different demands. The once-lively debate between partisans of systems views and partisans of process views has now largely died down. It has not, however, been clearly resolved in favour of either camp, and progress towards resolving it might be made by bringing the available evidence into contact with detailed theories of natural kinds.