The present disclosure relates to a step stool, and particularly to a folding step stool including legs that fold between an opened, use position and a collapsed, folded position. The present disclosure also relates to a tray assembly that moves relative to the legs and is used for storing or holding articles associated with use of the step stool. The step stool includes a mechanism to coordinate the movement of the tray assembly and a step of the step stool when the step stool is moved between the opened and collapsed positions.