Abstract: The tray or tray assembly of this invention allows hobbyists and professionals working on a step ladder to have easy and stable access to their tools and equipment. The tray is attached directly or by way of a support backing to struts on the ladder such that it projects outwards from the front or back to which it is attached. The tray or tray assembly can be built with a bracket that opposed diverging channels that engage diverging struts on the ladder so as to support the tray and its contents. As a result, the tray is vertically positioned within the footprint of the ladder, providing a convenient, stable, and safe arrangement by which the user may attend to the task at hand.