Jönne Speck (Birkbeck) gives a talk at the Workshop on Groundedness (26-27 October, 2012) titled "Grounding Class Theory". Abstract: In this talk, I propose a conception of proper class. It brings together two separate strands of research: metaphysical and semantical groundedness.

On the one hand, I use the *metaphysical* concept of grounding. Whether or not something is a member of a class, I will argue, must be grounded in other facts.

On the other hand, the method of *semantical* groundedness will provide a formal theory that captures this conception of class.